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-rw-r--r--fs/afs/Makefile3
-rw-r--r--fs/afs/afs_fs.h2
-rw-r--r--fs/afs/dir.c1
-rw-r--r--fs/afs/file.c32
-rw-r--r--fs/afs/fsclient.c332
-rw-r--r--fs/afs/inode.c47
-rw-r--r--fs/afs/internal.h66
-rw-r--r--fs/afs/rxrpc.c80
-rw-r--r--fs/afs/super.c5
-rw-r--r--fs/afs/vnode.c107
-rw-r--r--fs/afs/write.c835
11 files changed, 1483 insertions, 27 deletions
diff --git a/fs/afs/Makefile b/fs/afs/Makefile
index cf83e5d63512..73ce561f3ea0 100644
--- a/fs/afs/Makefile
+++ b/fs/afs/Makefile
@@ -22,6 +22,7 @@ kafs-objs := \
22 vlclient.o \ 22 vlclient.o \
23 vlocation.o \ 23 vlocation.o \
24 vnode.o \ 24 vnode.o \
25 volume.o 25 volume.o \
26 write.o
26 27
27obj-$(CONFIG_AFS_FS) := kafs.o 28obj-$(CONFIG_AFS_FS) := kafs.o
diff --git a/fs/afs/afs_fs.h b/fs/afs/afs_fs.h
index 89e0d1650a72..2198006d2d03 100644
--- a/fs/afs/afs_fs.h
+++ b/fs/afs/afs_fs.h
@@ -18,6 +18,8 @@
18enum AFS_FS_Operations { 18enum AFS_FS_Operations {
19 FSFETCHDATA = 130, /* AFS Fetch file data */ 19 FSFETCHDATA = 130, /* AFS Fetch file data */
20 FSFETCHSTATUS = 132, /* AFS Fetch file status */ 20 FSFETCHSTATUS = 132, /* AFS Fetch file status */
21 FSSTOREDATA = 133, /* AFS Store file data */
22 FSSTORESTATUS = 135, /* AFS Store file status */
21 FSREMOVEFILE = 136, /* AFS Remove a file */ 23 FSREMOVEFILE = 136, /* AFS Remove a file */
22 FSCREATEFILE = 137, /* AFS Create a file */ 24 FSCREATEFILE = 137, /* AFS Create a file */
23 FSRENAME = 138, /* AFS Rename or move a file or directory */ 25 FSRENAME = 138, /* AFS Rename or move a file or directory */
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 51f177af5dd6..2fb31276196b 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -56,6 +56,7 @@ const struct inode_operations afs_dir_inode_operations = {
56 .rename = afs_rename, 56 .rename = afs_rename,
57 .permission = afs_permission, 57 .permission = afs_permission,
58 .getattr = afs_getattr, 58 .getattr = afs_getattr,
59 .setattr = afs_setattr,
59}; 60};
60 61
61static struct dentry_operations afs_fs_dentry_operations = { 62static struct dentry_operations afs_fs_dentry_operations = {
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 3eb3fc7b36be..3e25795e5a42 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -15,32 +15,43 @@
15#include <linux/slab.h> 15#include <linux/slab.h>
16#include <linux/fs.h> 16#include <linux/fs.h>
17#include <linux/pagemap.h> 17#include <linux/pagemap.h>
18#include <linux/writeback.h>
18#include "internal.h" 19#include "internal.h"
19 20
20static int afs_readpage(struct file *file, struct page *page); 21static int afs_readpage(struct file *file, struct page *page);
21static void afs_invalidatepage(struct page *page, unsigned long offset); 22static void afs_invalidatepage(struct page *page, unsigned long offset);
22static int afs_releasepage(struct page *page, gfp_t gfp_flags); 23static int afs_releasepage(struct page *page, gfp_t gfp_flags);
24static int afs_launder_page(struct page *page);
23 25
24const struct file_operations afs_file_operations = { 26const struct file_operations afs_file_operations = {
25 .open = afs_open, 27 .open = afs_open,
26 .release = afs_release, 28 .release = afs_release,
27 .llseek = generic_file_llseek, 29 .llseek = generic_file_llseek,
28 .read = do_sync_read, 30 .read = do_sync_read,
31 .write = do_sync_write,
29 .aio_read = generic_file_aio_read, 32 .aio_read = generic_file_aio_read,
33 .aio_write = afs_file_write,
30 .mmap = generic_file_readonly_mmap, 34 .mmap = generic_file_readonly_mmap,
31 .sendfile = generic_file_sendfile, 35 .sendfile = generic_file_sendfile,
36 .fsync = afs_fsync,
32}; 37};
33 38
34const struct inode_operations afs_file_inode_operations = { 39const struct inode_operations afs_file_inode_operations = {
35 .getattr = afs_getattr, 40 .getattr = afs_getattr,
41 .setattr = afs_setattr,
36 .permission = afs_permission, 42 .permission = afs_permission,
37}; 43};
38 44
39const struct address_space_operations afs_fs_aops = { 45const struct address_space_operations afs_fs_aops = {
40 .readpage = afs_readpage, 46 .readpage = afs_readpage,
41 .set_page_dirty = __set_page_dirty_nobuffers, 47 .set_page_dirty = afs_set_page_dirty,
48 .launder_page = afs_launder_page,
42 .releasepage = afs_releasepage, 49 .releasepage = afs_releasepage,
43 .invalidatepage = afs_invalidatepage, 50 .invalidatepage = afs_invalidatepage,
51 .prepare_write = afs_prepare_write,
52 .commit_write = afs_commit_write,
53 .writepage = afs_writepage,
54 .writepages = afs_writepages,
44}; 55};
45 56
46/* 57/*
@@ -230,11 +241,6 @@ static void afs_invalidatepage(struct page *page, unsigned long offset)
230 BUG_ON(!PageLocked(page)); 241 BUG_ON(!PageLocked(page));
231 242
232 if (PagePrivate(page)) { 243 if (PagePrivate(page)) {
233#ifdef AFS_CACHING_SUPPORT
234 struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
235 cachefs_uncache_page(vnode->cache,page);
236#endif
237
238 /* We release buffers only if the entire page is being 244 /* We release buffers only if the entire page is being
239 * invalidated. 245 * invalidated.
240 * The get_block cached value has been unconditionally 246 * The get_block cached value has been unconditionally
@@ -255,19 +261,33 @@ static void afs_invalidatepage(struct page *page, unsigned long offset)
255} 261}
256 262
257/* 263/*
264 * write back a dirty page
265 */
266static int afs_launder_page(struct page *page)
267{
268 _enter("{%lu}", page->index);
269
270 return 0;
271}
272
273/*
258 * release a page and cleanup its private data 274 * release a page and cleanup its private data
259 */ 275 */
260static int afs_releasepage(struct page *page, gfp_t gfp_flags) 276static int afs_releasepage(struct page *page, gfp_t gfp_flags)
261{ 277{
262 struct afs_vnode *vnode = AFS_FS_I(page->mapping->host); 278 struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
279 struct afs_writeback *wb;
263 280
264 _enter("{{%x:%u}[%lu],%lx},%x", 281 _enter("{{%x:%u}[%lu],%lx},%x",
265 vnode->fid.vid, vnode->fid.vnode, page->index, page->flags, 282 vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
266 gfp_flags); 283 gfp_flags);
267 284
268 if (PagePrivate(page)) { 285 if (PagePrivate(page)) {
286 wb = (struct afs_writeback *) page_private(page);
287 ASSERT(wb != NULL);
269 set_page_private(page, 0); 288 set_page_private(page, 0);
270 ClearPagePrivate(page); 289 ClearPagePrivate(page);
290 afs_put_writeback(wb);
271 } 291 }
272 292
273 _leave(" = 0"); 293 _leave(" = 0");
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 1e65fee36413..025b1903d9e1 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -33,8 +33,10 @@ static void xdr_decode_AFSFid(const __be32 **_bp, struct afs_fid *fid)
33 */ 33 */
34static void xdr_decode_AFSFetchStatus(const __be32 **_bp, 34static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
35 struct afs_file_status *status, 35 struct afs_file_status *status,
36 struct afs_vnode *vnode) 36 struct afs_vnode *vnode,
37 afs_dataversion_t *store_version)
37{ 38{
39 afs_dataversion_t expected_version;
38 const __be32 *bp = *_bp; 40 const __be32 *bp = *_bp;
39 umode_t mode; 41 umode_t mode;
40 u64 data_version, size; 42 u64 data_version, size;
@@ -101,7 +103,11 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
101 vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime; 103 vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
102 } 104 }
103 105
104 if (status->data_version != data_version) { 106 expected_version = status->data_version;
107 if (store_version)
108 expected_version = *store_version;
109
110 if (expected_version != data_version) {
105 status->data_version = data_version; 111 status->data_version = data_version;
106 if (vnode && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) { 112 if (vnode && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
107 _debug("vnode modified %llx on {%x:%u}", 113 _debug("vnode modified %llx on {%x:%u}",
@@ -110,6 +116,8 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
110 set_bit(AFS_VNODE_MODIFIED, &vnode->flags); 116 set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
111 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 117 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
112 } 118 }
119 } else if (store_version) {
120 status->data_version = data_version;
113 } 121 }
114} 122}
115 123
@@ -156,6 +164,44 @@ static void xdr_decode_AFSVolSync(const __be32 **_bp,
156} 164}
157 165
158/* 166/*
167 * encode the requested attributes into an AFSStoreStatus block
168 */
169static void xdr_encode_AFS_StoreStatus(__be32 **_bp, struct iattr *attr)
170{
171 __be32 *bp = *_bp;
172 u32 mask = 0, mtime = 0, owner = 0, group = 0, mode = 0;
173
174 mask = 0;
175 if (attr->ia_valid & ATTR_MTIME) {
176 mask |= AFS_SET_MTIME;
177 mtime = attr->ia_mtime.tv_sec;
178 }
179
180 if (attr->ia_valid & ATTR_UID) {
181 mask |= AFS_SET_OWNER;
182 owner = attr->ia_uid;
183 }
184
185 if (attr->ia_valid & ATTR_GID) {
186 mask |= AFS_SET_GROUP;
187 group = attr->ia_gid;
188 }
189
190 if (attr->ia_valid & ATTR_MODE) {
191 mask |= AFS_SET_MODE;
192 mode = attr->ia_mode & S_IALLUGO;
193 }
194
195 *bp++ = htonl(mask);
196 *bp++ = htonl(mtime);
197 *bp++ = htonl(owner);
198 *bp++ = htonl(group);
199 *bp++ = htonl(mode);
200 *bp++ = 0; /* segment size */
201 *_bp = bp;
202}
203
204/*
159 * deliver reply data to an FS.FetchStatus 205 * deliver reply data to an FS.FetchStatus
160 */ 206 */
161static int afs_deliver_fs_fetch_status(struct afs_call *call, 207static int afs_deliver_fs_fetch_status(struct afs_call *call,
@@ -175,7 +221,7 @@ static int afs_deliver_fs_fetch_status(struct afs_call *call,
175 221
176 /* unmarshall the reply once we've received all of it */ 222 /* unmarshall the reply once we've received all of it */
177 bp = call->buffer; 223 bp = call->buffer;
178 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 224 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
179 xdr_decode_AFSCallBack(&bp, vnode); 225 xdr_decode_AFSCallBack(&bp, vnode);
180 if (call->reply2) 226 if (call->reply2)
181 xdr_decode_AFSVolSync(&bp, call->reply2); 227 xdr_decode_AFSVolSync(&bp, call->reply2);
@@ -295,7 +341,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
295 } 341 }
296 342
297 bp = call->buffer; 343 bp = call->buffer;
298 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 344 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
299 xdr_decode_AFSCallBack(&bp, vnode); 345 xdr_decode_AFSCallBack(&bp, vnode);
300 if (call->reply2) 346 if (call->reply2)
301 xdr_decode_AFSVolSync(&bp, call->reply2); 347 xdr_decode_AFSVolSync(&bp, call->reply2);
@@ -479,8 +525,8 @@ static int afs_deliver_fs_create_vnode(struct afs_call *call,
479 /* unmarshall the reply once we've received all of it */ 525 /* unmarshall the reply once we've received all of it */
480 bp = call->buffer; 526 bp = call->buffer;
481 xdr_decode_AFSFid(&bp, call->reply2); 527 xdr_decode_AFSFid(&bp, call->reply2);
482 xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL); 528 xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
483 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 529 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
484 xdr_decode_AFSCallBack_raw(&bp, call->reply4); 530 xdr_decode_AFSCallBack_raw(&bp, call->reply4);
485 /* xdr_decode_AFSVolSync(&bp, call->replyX); */ 531 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
486 532
@@ -577,7 +623,7 @@ static int afs_deliver_fs_remove(struct afs_call *call,
577 623
578 /* unmarshall the reply once we've received all of it */ 624 /* unmarshall the reply once we've received all of it */
579 bp = call->buffer; 625 bp = call->buffer;
580 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 626 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
581 /* xdr_decode_AFSVolSync(&bp, call->replyX); */ 627 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
582 628
583 _leave(" = 0 [done]"); 629 _leave(" = 0 [done]");
@@ -660,8 +706,8 @@ static int afs_deliver_fs_link(struct afs_call *call,
660 706
661 /* unmarshall the reply once we've received all of it */ 707 /* unmarshall the reply once we've received all of it */
662 bp = call->buffer; 708 bp = call->buffer;
663 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 709 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
664 xdr_decode_AFSFetchStatus(&bp, &dvnode->status, dvnode); 710 xdr_decode_AFSFetchStatus(&bp, &dvnode->status, dvnode, NULL);
665 /* xdr_decode_AFSVolSync(&bp, call->replyX); */ 711 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
666 712
667 _leave(" = 0 [done]"); 713 _leave(" = 0 [done]");
@@ -749,8 +795,8 @@ static int afs_deliver_fs_symlink(struct afs_call *call,
749 /* unmarshall the reply once we've received all of it */ 795 /* unmarshall the reply once we've received all of it */
750 bp = call->buffer; 796 bp = call->buffer;
751 xdr_decode_AFSFid(&bp, call->reply2); 797 xdr_decode_AFSFid(&bp, call->reply2);
752 xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL); 798 xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
753 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode); 799 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
754 /* xdr_decode_AFSVolSync(&bp, call->replyX); */ 800 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
755 801
756 _leave(" = 0 [done]"); 802 _leave(" = 0 [done]");
@@ -855,9 +901,10 @@ static int afs_deliver_fs_rename(struct afs_call *call,
855 901
856 /* unmarshall the reply once we've received all of it */ 902 /* unmarshall the reply once we've received all of it */
857 bp = call->buffer; 903 bp = call->buffer;
858 xdr_decode_AFSFetchStatus(&bp, &orig_dvnode->status, orig_dvnode); 904 xdr_decode_AFSFetchStatus(&bp, &orig_dvnode->status, orig_dvnode, NULL);
859 if (new_dvnode != orig_dvnode) 905 if (new_dvnode != orig_dvnode)
860 xdr_decode_AFSFetchStatus(&bp, &new_dvnode->status, new_dvnode); 906 xdr_decode_AFSFetchStatus(&bp, &new_dvnode->status, new_dvnode,
907 NULL);
861 /* xdr_decode_AFSVolSync(&bp, call->replyX); */ 908 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
862 909
863 _leave(" = 0 [done]"); 910 _leave(" = 0 [done]");
@@ -939,3 +986,262 @@ int afs_fs_rename(struct afs_server *server,
939 986
940 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode); 987 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
941} 988}
989
990/*
991 * deliver reply data to an FS.StoreData
992 */
993static int afs_deliver_fs_store_data(struct afs_call *call,
994 struct sk_buff *skb, bool last)
995{
996 struct afs_vnode *vnode = call->reply;
997 const __be32 *bp;
998
999 _enter(",,%u", last);
1000
1001 afs_transfer_reply(call, skb);
1002 if (!last) {
1003 _leave(" = 0 [more]");
1004 return 0;
1005 }
1006
1007 if (call->reply_size != call->reply_max) {
1008 _leave(" = -EBADMSG [%u != %u]",
1009 call->reply_size, call->reply_max);
1010 return -EBADMSG;
1011 }
1012
1013 /* unmarshall the reply once we've received all of it */
1014 bp = call->buffer;
1015 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode,
1016 &call->store_version);
1017 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
1018
1019 afs_pages_written_back(vnode, call);
1020
1021 _leave(" = 0 [done]");
1022 return 0;
1023}
1024
1025/*
1026 * FS.StoreData operation type
1027 */
1028static const struct afs_call_type afs_RXFSStoreData = {
1029 .name = "FS.StoreData",
1030 .deliver = afs_deliver_fs_store_data,
1031 .abort_to_error = afs_abort_to_error,
1032 .destructor = afs_flat_call_destructor,
1033};
1034
1035/*
1036 * store a set of pages
1037 */
1038int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb,
1039 pgoff_t first, pgoff_t last,
1040 unsigned offset, unsigned to,
1041 const struct afs_wait_mode *wait_mode)
1042{
1043 struct afs_vnode *vnode = wb->vnode;
1044 struct afs_call *call;
1045 loff_t size, pos, i_size;
1046 __be32 *bp;
1047
1048 _enter(",%x,{%x:%u},,",
1049 key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode);
1050
1051 size = to - offset;
1052 if (first != last)
1053 size += (loff_t)(last - first) << PAGE_SHIFT;
1054 pos = (loff_t)first << PAGE_SHIFT;
1055 pos += offset;
1056
1057 i_size = i_size_read(&vnode->vfs_inode);
1058 if (pos + size > i_size)
1059 i_size = size + pos;
1060
1061 _debug("size %llx, at %llx, i_size %llx",
1062 (unsigned long long) size, (unsigned long long) pos,
1063 (unsigned long long) i_size);
1064
1065 BUG_ON(i_size > 0xffffffff); // TODO: use 64-bit store
1066
1067 call = afs_alloc_flat_call(&afs_RXFSStoreData,
1068 (4 + 6 + 3) * 4,
1069 (21 + 6) * 4);
1070 if (!call)
1071 return -ENOMEM;
1072
1073 call->wb = wb;
1074 call->key = wb->key;
1075 call->reply = vnode;
1076 call->service_id = FS_SERVICE;
1077 call->port = htons(AFS_FS_PORT);
1078 call->mapping = vnode->vfs_inode.i_mapping;
1079 call->first = first;
1080 call->last = last;
1081 call->first_offset = offset;
1082 call->last_to = to;
1083 call->send_pages = true;
1084 call->store_version = vnode->status.data_version + 1;
1085
1086 /* marshall the parameters */
1087 bp = call->request;
1088 *bp++ = htonl(FSSTOREDATA);
1089 *bp++ = htonl(vnode->fid.vid);
1090 *bp++ = htonl(vnode->fid.vnode);
1091 *bp++ = htonl(vnode->fid.unique);
1092
1093 *bp++ = 0; /* mask */
1094 *bp++ = 0; /* mtime */
1095 *bp++ = 0; /* owner */
1096 *bp++ = 0; /* group */
1097 *bp++ = 0; /* unix mode */
1098 *bp++ = 0; /* segment size */
1099
1100 *bp++ = htonl(pos);
1101 *bp++ = htonl(size);
1102 *bp++ = htonl(i_size);
1103
1104 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
1105}
1106
1107/*
1108 * deliver reply data to an FS.StoreStatus
1109 */
1110static int afs_deliver_fs_store_status(struct afs_call *call,
1111 struct sk_buff *skb, bool last)
1112{
1113 afs_dataversion_t *store_version;
1114 struct afs_vnode *vnode = call->reply;
1115 const __be32 *bp;
1116
1117 _enter(",,%u", last);
1118
1119 afs_transfer_reply(call, skb);
1120 if (!last) {
1121 _leave(" = 0 [more]");
1122 return 0;
1123 }
1124
1125 if (call->reply_size != call->reply_max) {
1126 _leave(" = -EBADMSG [%u != %u]",
1127 call->reply_size, call->reply_max);
1128 return -EBADMSG;
1129 }
1130
1131 /* unmarshall the reply once we've received all of it */
1132 store_version = NULL;
1133 if (call->operation_ID == FSSTOREDATA)
1134 store_version = &call->store_version;
1135
1136 bp = call->buffer;
1137 xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, store_version);
1138 /* xdr_decode_AFSVolSync(&bp, call->replyX); */
1139
1140 _leave(" = 0 [done]");
1141 return 0;
1142}
1143
1144/*
1145 * FS.StoreStatus operation type
1146 */
1147static const struct afs_call_type afs_RXFSStoreStatus = {
1148 .name = "FS.StoreStatus",
1149 .deliver = afs_deliver_fs_store_status,
1150 .abort_to_error = afs_abort_to_error,
1151 .destructor = afs_flat_call_destructor,
1152};
1153
1154static const struct afs_call_type afs_RXFSStoreData_as_Status = {
1155 .name = "FS.StoreData",
1156 .deliver = afs_deliver_fs_store_status,
1157 .abort_to_error = afs_abort_to_error,
1158 .destructor = afs_flat_call_destructor,
1159};
1160
1161/*
1162 * set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
1163 * so as to alter the file size also
1164 */
1165static int afs_fs_setattr_size(struct afs_server *server, struct key *key,
1166 struct afs_vnode *vnode, struct iattr *attr,
1167 const struct afs_wait_mode *wait_mode)
1168{
1169 struct afs_call *call;
1170 __be32 *bp;
1171
1172 _enter(",%x,{%x:%u},,",
1173 key_serial(key), vnode->fid.vid, vnode->fid.vnode);
1174
1175 ASSERT(attr->ia_valid & ATTR_SIZE);
1176 ASSERTCMP(attr->ia_size, <=, 0xffffffff); // TODO: use 64-bit store
1177
1178 call = afs_alloc_flat_call(&afs_RXFSStoreData_as_Status,
1179 (4 + 6 + 3) * 4,
1180 (21 + 6) * 4);
1181 if (!call)
1182 return -ENOMEM;
1183
1184 call->key = key;
1185 call->reply = vnode;
1186 call->service_id = FS_SERVICE;
1187 call->port = htons(AFS_FS_PORT);
1188 call->store_version = vnode->status.data_version + 1;
1189 call->operation_ID = FSSTOREDATA;
1190
1191 /* marshall the parameters */
1192 bp = call->request;
1193 *bp++ = htonl(FSSTOREDATA);
1194 *bp++ = htonl(vnode->fid.vid);
1195 *bp++ = htonl(vnode->fid.vnode);
1196 *bp++ = htonl(vnode->fid.unique);
1197
1198 xdr_encode_AFS_StoreStatus(&bp, attr);
1199
1200 *bp++ = 0; /* position of start of write */
1201 *bp++ = 0; /* size of write */
1202 *bp++ = htonl(attr->ia_size); /* new file length */
1203
1204 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
1205}
1206
1207/*
1208 * set the attributes on a file, using FS.StoreData if there's a change in file
1209 * size, and FS.StoreStatus otherwise
1210 */
1211int afs_fs_setattr(struct afs_server *server, struct key *key,
1212 struct afs_vnode *vnode, struct iattr *attr,
1213 const struct afs_wait_mode *wait_mode)
1214{
1215 struct afs_call *call;
1216 __be32 *bp;
1217
1218 if (attr->ia_valid & ATTR_SIZE)
1219 return afs_fs_setattr_size(server, key, vnode, attr,
1220 wait_mode);
1221
1222 _enter(",%x,{%x:%u},,",
1223 key_serial(key), vnode->fid.vid, vnode->fid.vnode);
1224
1225 call = afs_alloc_flat_call(&afs_RXFSStoreStatus,
1226 (4 + 6) * 4,
1227 (21 + 6) * 4);
1228 if (!call)
1229 return -ENOMEM;
1230
1231 call->key = key;
1232 call->reply = vnode;
1233 call->service_id = FS_SERVICE;
1234 call->port = htons(AFS_FS_PORT);
1235 call->operation_ID = FSSTORESTATUS;
1236
1237 /* marshall the parameters */
1238 bp = call->request;
1239 *bp++ = htonl(FSSTORESTATUS);
1240 *bp++ = htonl(vnode->fid.vid);
1241 *bp++ = htonl(vnode->fid.vnode);
1242 *bp++ = htonl(vnode->fid.unique);
1243
1244 xdr_encode_AFS_StoreStatus(&bp, attr);
1245
1246 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
1247}
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 9c984cc42cc9..515a5d12d8fb 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -209,7 +209,7 @@ bad_inode:
209 */ 209 */
210void afs_zap_data(struct afs_vnode *vnode) 210void afs_zap_data(struct afs_vnode *vnode)
211{ 211{
212 kenter("zap data {%x:%u}", vnode->fid.vid, vnode->fid.vnode); 212 _enter("zap data {%x:%u}", vnode->fid.vid, vnode->fid.vnode);
213 213
214 /* nuke all the non-dirty pages that aren't locked, mapped or being 214 /* nuke all the non-dirty pages that aren't locked, mapped or being
215 * written back */ 215 * written back */
@@ -334,6 +334,7 @@ void afs_clear_inode(struct inode *inode)
334 vnode->server = NULL; 334 vnode->server = NULL;
335 } 335 }
336 336
337 ASSERT(list_empty(&vnode->writebacks));
337 ASSERT(!vnode->cb_promised); 338 ASSERT(!vnode->cb_promised);
338 339
339#ifdef AFS_CACHING_SUPPORT 340#ifdef AFS_CACHING_SUPPORT
@@ -350,3 +351,47 @@ void afs_clear_inode(struct inode *inode)
350 351
351 _leave(""); 352 _leave("");
352} 353}
354
355/*
356 * set the attributes of an inode
357 */
358int afs_setattr(struct dentry *dentry, struct iattr *attr)
359{
360 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
361 struct key *key;
362 int ret;
363
364 _enter("{%x:%u},{n=%s},%x",
365 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
366 attr->ia_valid);
367
368 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
369 ATTR_MTIME))) {
370 _leave(" = 0 [unsupported]");
371 return 0;
372 }
373
374 /* flush any dirty data outstanding on a regular file */
375 if (S_ISREG(vnode->vfs_inode.i_mode)) {
376 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
377 afs_writeback_all(vnode);
378 }
379
380 if (attr->ia_valid & ATTR_FILE) {
381 key = attr->ia_file->private_data;
382 } else {
383 key = afs_request_key(vnode->volume->cell);
384 if (IS_ERR(key)) {
385 ret = PTR_ERR(key);
386 goto error;
387 }
388 }
389
390 ret = afs_vnode_setattr(vnode, key, attr);
391 if (!(attr->ia_valid & ATTR_FILE))
392 key_put(key);
393
394error:
395 _leave(" = %d", ret);
396 return ret;
397}
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 9feb5c59d8fc..a30d4fa768e3 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -21,6 +21,7 @@
21 21
22#define AFS_CELL_MAX_ADDRS 15 22#define AFS_CELL_MAX_ADDRS 15
23 23
24struct pagevec;
24struct afs_call; 25struct afs_call;
25 26
26typedef enum { 27typedef enum {
@@ -75,12 +76,15 @@ struct afs_call {
75 struct key *key; /* security for this call */ 76 struct key *key; /* security for this call */
76 struct afs_server *server; /* server affected by incoming CM call */ 77 struct afs_server *server; /* server affected by incoming CM call */
77 void *request; /* request data (first part) */ 78 void *request; /* request data (first part) */
78 void *request2; /* request data (second part) */ 79 struct address_space *mapping; /* page set */
80 struct afs_writeback *wb; /* writeback being performed */
79 void *buffer; /* reply receive buffer */ 81 void *buffer; /* reply receive buffer */
80 void *reply; /* reply buffer (first part) */ 82 void *reply; /* reply buffer (first part) */
81 void *reply2; /* reply buffer (second part) */ 83 void *reply2; /* reply buffer (second part) */
82 void *reply3; /* reply buffer (third part) */ 84 void *reply3; /* reply buffer (third part) */
83 void *reply4; /* reply buffer (fourth part) */ 85 void *reply4; /* reply buffer (fourth part) */
86 pgoff_t first; /* first page in mapping to deal with */
87 pgoff_t last; /* last page in mapping to deal with */
84 enum { /* call state */ 88 enum { /* call state */
85 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 89 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
86 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 90 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
@@ -97,14 +101,18 @@ struct afs_call {
97 unsigned request_size; /* size of request data */ 101 unsigned request_size; /* size of request data */
98 unsigned reply_max; /* maximum size of reply */ 102 unsigned reply_max; /* maximum size of reply */
99 unsigned reply_size; /* current size of reply */ 103 unsigned reply_size; /* current size of reply */
104 unsigned first_offset; /* offset into mapping[first] */
105 unsigned last_to; /* amount of mapping[last] */
100 unsigned short offset; /* offset into received data store */ 106 unsigned short offset; /* offset into received data store */
101 unsigned char unmarshall; /* unmarshalling phase */ 107 unsigned char unmarshall; /* unmarshalling phase */
102 bool incoming; /* T if incoming call */ 108 bool incoming; /* T if incoming call */
109 bool send_pages; /* T if data from mapping should be sent */
103 u16 service_id; /* RxRPC service ID to call */ 110 u16 service_id; /* RxRPC service ID to call */
104 __be16 port; /* target UDP port */ 111 __be16 port; /* target UDP port */
105 __be32 operation_ID; /* operation ID for an incoming call */ 112 __be32 operation_ID; /* operation ID for an incoming call */
106 u32 count; /* count for use in unmarshalling */ 113 u32 count; /* count for use in unmarshalling */
107 __be32 tmp; /* place to extract temporary data */ 114 __be32 tmp; /* place to extract temporary data */
115 afs_dataversion_t store_version; /* updated version expected from store */
108}; 116};
109 117
110struct afs_call_type { 118struct afs_call_type {
@@ -124,6 +132,32 @@ struct afs_call_type {
124}; 132};
125 133
126/* 134/*
135 * record of an outstanding writeback on a vnode
136 */
137struct afs_writeback {
138 struct list_head link; /* link in vnode->writebacks */
139 struct work_struct writer; /* work item to perform the writeback */
140 struct afs_vnode *vnode; /* vnode to which this write applies */
141 struct key *key; /* owner of this write */
142 wait_queue_head_t waitq; /* completion and ready wait queue */
143 pgoff_t first; /* first page in batch */
144 pgoff_t point; /* last page in current store op */
145 pgoff_t last; /* last page in batch (inclusive) */
146 unsigned offset_first; /* offset into first page of start of write */
147 unsigned to_last; /* offset into last page of end of write */
148 int num_conflicts; /* count of conflicting writes in list */
149 int usage;
150 bool conflicts; /* T if has dependent conflicts */
151 enum {
152 AFS_WBACK_SYNCING, /* synchronisation being performed */
153 AFS_WBACK_PENDING, /* write pending */
154 AFS_WBACK_CONFLICTING, /* conflicting writes posted */
155 AFS_WBACK_WRITING, /* writing back */
156 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */
157 } state __attribute__((packed));
158};
159
160/*
127 * AFS superblock private data 161 * AFS superblock private data
128 * - there's one superblock per volume 162 * - there's one superblock per volume
129 */ 163 */
@@ -305,6 +339,7 @@ struct afs_vnode {
305 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 339 wait_queue_head_t update_waitq; /* status fetch waitqueue */
306 int update_cnt; /* number of outstanding ops that will update the 340 int update_cnt; /* number of outstanding ops that will update the
307 * status */ 341 * status */
342 spinlock_t writeback_lock; /* lock for writebacks */
308 spinlock_t lock; /* waitqueue/flags lock */ 343 spinlock_t lock; /* waitqueue/flags lock */
309 unsigned long flags; 344 unsigned long flags;
310#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 345#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
@@ -316,6 +351,8 @@ struct afs_vnode {
316 351
317 long acl_order; /* ACL check count (callback break count) */ 352 long acl_order; /* ACL check count (callback break count) */
318 353
354 struct list_head writebacks; /* alterations in pagecache that need writing */
355
319 /* outstanding callback notification on this file */ 356 /* outstanding callback notification on this file */
320 struct rb_node server_rb; /* link in server->fs_vnodes */ 357 struct rb_node server_rb; /* link in server->fs_vnodes */
321 struct rb_node cb_promise; /* link in server->cb_promises */ 358 struct rb_node cb_promise; /* link in server->cb_promises */
@@ -463,6 +500,12 @@ extern int afs_fs_rename(struct afs_server *, struct key *,
463 struct afs_vnode *, const char *, 500 struct afs_vnode *, const char *,
464 struct afs_vnode *, const char *, 501 struct afs_vnode *, const char *,
465 const struct afs_wait_mode *); 502 const struct afs_wait_mode *);
503extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
504 pgoff_t, pgoff_t, unsigned, unsigned,
505 const struct afs_wait_mode *);
506extern int afs_fs_setattr(struct afs_server *, struct key *,
507 struct afs_vnode *, struct iattr *,
508 const struct afs_wait_mode *);
466 509
467/* 510/*
468 * inode.c 511 * inode.c
@@ -473,6 +516,7 @@ extern struct inode *afs_iget(struct super_block *, struct key *,
473extern void afs_zap_data(struct afs_vnode *); 516extern void afs_zap_data(struct afs_vnode *);
474extern int afs_validate(struct afs_vnode *, struct key *); 517extern int afs_validate(struct afs_vnode *, struct key *);
475extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 518extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
519extern int afs_setattr(struct dentry *, struct iattr *);
476extern void afs_clear_inode(struct inode *); 520extern void afs_clear_inode(struct inode *);
477 521
478/* 522/*
@@ -625,6 +669,9 @@ extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
625 struct afs_file_status *, struct afs_server **); 669 struct afs_file_status *, struct afs_server **);
626extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 670extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
627 struct key *, const char *, const char *); 671 struct key *, const char *, const char *);
672extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
673 unsigned, unsigned);
674extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
628 675
629/* 676/*
630 * volume.c 677 * volume.c
@@ -641,6 +688,23 @@ extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
641extern int afs_volume_release_fileserver(struct afs_vnode *, 688extern int afs_volume_release_fileserver(struct afs_vnode *,
642 struct afs_server *, int); 689 struct afs_server *, int);
643 690
691/*
692 * write.c
693 */
694extern int afs_set_page_dirty(struct page *);
695extern void afs_put_writeback(struct afs_writeback *);
696extern int afs_prepare_write(struct file *, struct page *, unsigned, unsigned);
697extern int afs_commit_write(struct file *, struct page *, unsigned, unsigned);
698extern int afs_writepage(struct page *, struct writeback_control *);
699extern int afs_writepages(struct address_space *, struct writeback_control *);
700extern int afs_write_inode(struct inode *, int);
701extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
702extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
703 unsigned long, loff_t);
704extern int afs_writeback_all(struct afs_vnode *);
705extern int afs_fsync(struct file *, struct dentry *, int);
706
707
644/*****************************************************************************/ 708/*****************************************************************************/
645/* 709/*
646 * debug tracing 710 * debug tracing
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 222c1a3abbb8..04189c47d6a0 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -237,6 +237,70 @@ void afs_flat_call_destructor(struct afs_call *call)
237} 237}
238 238
239/* 239/*
240 * attach the data from a bunch of pages on an inode to a call
241 */
242int afs_send_pages(struct afs_call *call, struct msghdr *msg, struct kvec *iov)
243{
244 struct page *pages[8];
245 unsigned count, n, loop, offset, to;
246 pgoff_t first = call->first, last = call->last;
247 int ret;
248
249 _enter("");
250
251 offset = call->first_offset;
252 call->first_offset = 0;
253
254 do {
255 _debug("attach %lx-%lx", first, last);
256
257 count = last - first + 1;
258 if (count > ARRAY_SIZE(pages))
259 count = ARRAY_SIZE(pages);
260 n = find_get_pages_contig(call->mapping, first, count, pages);
261 ASSERTCMP(n, ==, count);
262
263 loop = 0;
264 do {
265 msg->msg_flags = 0;
266 to = PAGE_SIZE;
267 if (first + loop >= last)
268 to = call->last_to;
269 else
270 msg->msg_flags = MSG_MORE;
271 iov->iov_base = kmap(pages[loop]) + offset;
272 iov->iov_len = to - offset;
273 offset = 0;
274
275 _debug("- range %u-%u%s",
276 offset, to, msg->msg_flags ? " [more]" : "");
277 msg->msg_iov = (struct iovec *) iov;
278 msg->msg_iovlen = 1;
279
280 /* have to change the state *before* sending the last
281 * packet as RxRPC might give us the reply before it
282 * returns from sending the request */
283 if (first + loop >= last)
284 call->state = AFS_CALL_AWAIT_REPLY;
285 ret = rxrpc_kernel_send_data(call->rxcall, msg,
286 to - offset);
287 kunmap(pages[loop]);
288 if (ret < 0)
289 break;
290 } while (++loop < count);
291 first += count;
292
293 for (loop = 0; loop < count; loop++)
294 put_page(pages[loop]);
295 if (ret < 0)
296 break;
297 } while (first < last);
298
299 _leave(" = %d", ret);
300 return ret;
301}
302
303/*
240 * initiate a call 304 * initiate a call
241 */ 305 */
242int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, 306int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
@@ -253,8 +317,9 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
253 ASSERT(call->type != NULL); 317 ASSERT(call->type != NULL);
254 ASSERT(call->type->name != NULL); 318 ASSERT(call->type->name != NULL);
255 319
256 _debug("MAKE %p{%s} [%d]", 320 _debug("____MAKE %p{%s,%x} [%d]____",
257 call, call->type->name, atomic_read(&afs_outstanding_calls)); 321 call, call->type->name, key_serial(call->key),
322 atomic_read(&afs_outstanding_calls));
258 323
259 call->wait_mode = wait_mode; 324 call->wait_mode = wait_mode;
260 INIT_WORK(&call->async_work, afs_process_async_call); 325 INIT_WORK(&call->async_work, afs_process_async_call);
@@ -289,16 +354,23 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
289 msg.msg_iovlen = 1; 354 msg.msg_iovlen = 1;
290 msg.msg_control = NULL; 355 msg.msg_control = NULL;
291 msg.msg_controllen = 0; 356 msg.msg_controllen = 0;
292 msg.msg_flags = 0; 357 msg.msg_flags = (call->send_pages ? MSG_MORE : 0);
293 358
294 /* have to change the state *before* sending the last packet as RxRPC 359 /* have to change the state *before* sending the last packet as RxRPC
295 * might give us the reply before it returns from sending the 360 * might give us the reply before it returns from sending the
296 * request */ 361 * request */
297 call->state = AFS_CALL_AWAIT_REPLY; 362 if (!call->send_pages)
363 call->state = AFS_CALL_AWAIT_REPLY;
298 ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); 364 ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size);
299 if (ret < 0) 365 if (ret < 0)
300 goto error_do_abort; 366 goto error_do_abort;
301 367
368 if (call->send_pages) {
369 ret = afs_send_pages(call, &msg, iov);
370 if (ret < 0)
371 goto error_do_abort;
372 }
373
302 /* at this point, an async call may no longer exist as it may have 374 /* at this point, an async call may no longer exist as it may have
303 * already completed */ 375 * already completed */
304 return wait_mode->wait(call); 376 return wait_mode->wait(call);
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 7030d76155fc..d24be334b608 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -50,6 +50,7 @@ static const struct super_operations afs_super_ops = {
50 .statfs = simple_statfs, 50 .statfs = simple_statfs,
51 .alloc_inode = afs_alloc_inode, 51 .alloc_inode = afs_alloc_inode,
52 .drop_inode = generic_delete_inode, 52 .drop_inode = generic_delete_inode,
53 .write_inode = afs_write_inode,
53 .destroy_inode = afs_destroy_inode, 54 .destroy_inode = afs_destroy_inode,
54 .clear_inode = afs_clear_inode, 55 .clear_inode = afs_clear_inode,
55 .umount_begin = afs_umount_begin, 56 .umount_begin = afs_umount_begin,
@@ -66,7 +67,7 @@ enum {
66 afs_opt_vol, 67 afs_opt_vol,
67}; 68};
68 69
69static const match_table_t afs_options_list = { 70static match_table_t afs_options_list = {
70 { afs_opt_cell, "cell=%s" }, 71 { afs_opt_cell, "cell=%s" },
71 { afs_opt_rwpath, "rwpath" }, 72 { afs_opt_rwpath, "rwpath" },
72 { afs_opt_vol, "vol=%s" }, 73 { afs_opt_vol, "vol=%s" },
@@ -459,7 +460,9 @@ static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
459 init_waitqueue_head(&vnode->update_waitq); 460 init_waitqueue_head(&vnode->update_waitq);
460 mutex_init(&vnode->permits_lock); 461 mutex_init(&vnode->permits_lock);
461 mutex_init(&vnode->validate_lock); 462 mutex_init(&vnode->validate_lock);
463 spin_lock_init(&vnode->writeback_lock);
462 spin_lock_init(&vnode->lock); 464 spin_lock_init(&vnode->lock);
465 INIT_LIST_HEAD(&vnode->writebacks);
463 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work); 466 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
464 } 467 }
465} 468}
diff --git a/fs/afs/vnode.c b/fs/afs/vnode.c
index 0e37f9949cb7..ec814660209f 100644
--- a/fs/afs/vnode.c
+++ b/fs/afs/vnode.c
@@ -753,3 +753,110 @@ no_server:
753 _leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt); 753 _leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt);
754 return PTR_ERR(server); 754 return PTR_ERR(server);
755} 755}
756
757/*
758 * write to a file
759 */
760int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
761 unsigned offset, unsigned to)
762{
763 struct afs_server *server;
764 struct afs_vnode *vnode = wb->vnode;
765 int ret;
766
767 _enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x",
768 vnode->volume->vlocation->vldb.name,
769 vnode->fid.vid,
770 vnode->fid.vnode,
771 vnode->fid.unique,
772 key_serial(wb->key),
773 first, last, offset, to);
774
775 /* this op will fetch the status */
776 spin_lock(&vnode->lock);
777 vnode->update_cnt++;
778 spin_unlock(&vnode->lock);
779
780 do {
781 /* pick a server to query */
782 server = afs_volume_pick_fileserver(vnode);
783 if (IS_ERR(server))
784 goto no_server;
785
786 _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
787
788 ret = afs_fs_store_data(server, wb, first, last, offset, to,
789 &afs_sync_call);
790
791 } while (!afs_volume_release_fileserver(vnode, server, ret));
792
793 /* adjust the flags */
794 if (ret == 0) {
795 afs_vnode_finalise_status_update(vnode, server);
796 afs_put_server(server);
797 } else {
798 afs_vnode_status_update_failed(vnode, ret);
799 }
800
801 _leave(" = %d", ret);
802 return ret;
803
804no_server:
805 spin_lock(&vnode->lock);
806 vnode->update_cnt--;
807 ASSERTCMP(vnode->update_cnt, >=, 0);
808 spin_unlock(&vnode->lock);
809 return PTR_ERR(server);
810}
811
812/*
813 * set the attributes on a file
814 */
815int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key,
816 struct iattr *attr)
817{
818 struct afs_server *server;
819 int ret;
820
821 _enter("%s{%x:%u.%u},%x",
822 vnode->volume->vlocation->vldb.name,
823 vnode->fid.vid,
824 vnode->fid.vnode,
825 vnode->fid.unique,
826 key_serial(key));
827
828 /* this op will fetch the status */
829 spin_lock(&vnode->lock);
830 vnode->update_cnt++;
831 spin_unlock(&vnode->lock);
832
833 do {
834 /* pick a server to query */
835 server = afs_volume_pick_fileserver(vnode);
836 if (IS_ERR(server))
837 goto no_server;
838
839 _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
840
841 ret = afs_fs_setattr(server, key, vnode, attr, &afs_sync_call);
842
843 } while (!afs_volume_release_fileserver(vnode, server, ret));
844
845 /* adjust the flags */
846 if (ret == 0) {
847 afs_vnode_finalise_status_update(vnode, server);
848 afs_put_server(server);
849 } else {
850 afs_vnode_status_update_failed(vnode, ret);
851 }
852
853 _leave(" = %d", ret);
854 return ret;
855
856no_server:
857 spin_lock(&vnode->lock);
858 vnode->update_cnt--;
859 ASSERTCMP(vnode->update_cnt, >=, 0);
860 spin_unlock(&vnode->lock);
861 return PTR_ERR(server);
862}
diff --git a/fs/afs/write.c b/fs/afs/write.c
new file mode 100644
index 000000000000..83ff29262816
--- /dev/null
+++ b/fs/afs/write.c
@@ -0,0 +1,835 @@
1/* handling of writes to regular files and writing back to the server
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/fs.h>
14#include <linux/pagemap.h>
15#include <linux/writeback.h>
16#include <linux/pagevec.h>
17#include "internal.h"
18
19static int afs_write_back_from_locked_page(struct afs_writeback *wb,
20 struct page *page);
21
22/*
23 * mark a page as having been made dirty and thus needing writeback
24 */
25int afs_set_page_dirty(struct page *page)
26{
27 _enter("");
28 return __set_page_dirty_nobuffers(page);
29}
30
31/*
32 * unlink a writeback record because its usage has reached zero
33 * - must be called with the wb->vnode->writeback_lock held
34 */
35static void afs_unlink_writeback(struct afs_writeback *wb)
36{
37 struct afs_writeback *front;
38 struct afs_vnode *vnode = wb->vnode;
39
40 list_del_init(&wb->link);
41 if (!list_empty(&vnode->writebacks)) {
42 /* if an fsync rises to the front of the queue then wake it
43 * up */
44 front = list_entry(vnode->writebacks.next,
45 struct afs_writeback, link);
46 if (front->state == AFS_WBACK_SYNCING) {
47 _debug("wake up sync");
48 front->state = AFS_WBACK_COMPLETE;
49 wake_up(&front->waitq);
50 }
51 }
52}
53
54/*
55 * free a writeback record
56 */
57static void afs_free_writeback(struct afs_writeback *wb)
58{
59 _enter("");
60 key_put(wb->key);
61 kfree(wb);
62}
63
64/*
65 * dispose of a reference to a writeback record
66 */
67void afs_put_writeback(struct afs_writeback *wb)
68{
69 struct afs_vnode *vnode = wb->vnode;
70
71 _enter("{%d}", wb->usage);
72
73 spin_lock(&vnode->writeback_lock);
74 if (--wb->usage == 0)
75 afs_unlink_writeback(wb);
76 else
77 wb = NULL;
78 spin_unlock(&vnode->writeback_lock);
79 if (wb)
80 afs_free_writeback(wb);
81}
82
83/*
84 * partly or wholly fill a page that's under preparation for writing
85 */
86static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
87 unsigned start, unsigned len, struct page *page)
88{
89 int ret;
90
91 _enter(",,%u,%u", start, len);
92
93 ASSERTCMP(start + len, <=, PAGE_SIZE);
94
95 ret = afs_vnode_fetch_data(vnode, key, start, len, page);
96 if (ret < 0) {
97 if (ret == -ENOENT) {
98 _debug("got NOENT from server"
99 " - marking file deleted and stale");
100 set_bit(AFS_VNODE_DELETED, &vnode->flags);
101 ret = -ESTALE;
102 }
103 }
104
105 _leave(" = %d", ret);
106 return ret;
107}
108
109/*
110 * prepare a page for being written to
111 */
112static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
113 struct key *key, unsigned offset, unsigned to)
114{
115 unsigned eof, tail, start, stop, len;
116 loff_t i_size, pos;
117 void *p;
118 int ret;
119
120 _enter("");
121
122 if (offset == 0 && to == PAGE_SIZE)
123 return 0;
124
125 p = kmap(page);
126
127 i_size = i_size_read(&vnode->vfs_inode);
128 pos = (loff_t) page->index << PAGE_SHIFT;
129 if (pos >= i_size) {
130 /* partial write, page beyond EOF */
131 _debug("beyond");
132 if (offset > 0)
133 memset(p, 0, offset);
134 if (to < PAGE_SIZE)
135 memset(p + to, 0, PAGE_SIZE - to);
136 kunmap(page);
137 return 0;
138 }
139
140 if (i_size - pos >= PAGE_SIZE) {
141 /* partial write, page entirely before EOF */
142 _debug("before");
143 tail = eof = PAGE_SIZE;
144 } else {
145 /* partial write, page overlaps EOF */
146 eof = i_size - pos;
147 _debug("overlap %u", eof);
148 tail = max(eof, to);
149 if (tail < PAGE_SIZE)
150 memset(p + tail, 0, PAGE_SIZE - tail);
151 if (offset > eof)
152 memset(p + eof, 0, PAGE_SIZE - eof);
153 }
154
155 kunmap(p);
156
157 ret = 0;
158 if (offset > 0 || eof > to) {
159 /* need to fill one or two bits that aren't going to be written
160 * (cover both fillers in one read if there are two) */
161 start = (offset > 0) ? 0 : to;
162 stop = (eof > to) ? eof : offset;
163 len = stop - start;
164 _debug("wr=%u-%u av=0-%u rd=%u@%u",
165 offset, to, eof, start, len);
166 ret = afs_fill_page(vnode, key, start, len, page);
167 }
168
169 _leave(" = %d", ret);
170 return ret;
171}
172
173/*
174 * prepare to perform part of a write to a page
175 * - the caller holds the page locked, preventing it from being written out or
176 * modified by anyone else
177 */
178int afs_prepare_write(struct file *file, struct page *page,
179 unsigned offset, unsigned to)
180{
181 struct afs_writeback *candidate, *wb;
182 struct afs_vnode *vnode = AFS_FS_I(file->f_dentry->d_inode);
183 struct key *key = file->private_data;
184 pgoff_t index;
185 int ret;
186
187 _enter("{%x:%u},{%lx},%u,%u",
188 vnode->fid.vid, vnode->fid.vnode, page->index, offset, to);
189
190 candidate = kzalloc(sizeof(*candidate), GFP_KERNEL);
191 if (!candidate)
192 return -ENOMEM;
193 candidate->vnode = vnode;
194 candidate->first = candidate->last = page->index;
195 candidate->offset_first = offset;
196 candidate->to_last = to;
197 candidate->usage = 1;
198 candidate->state = AFS_WBACK_PENDING;
199 init_waitqueue_head(&candidate->waitq);
200
201 if (!PageUptodate(page)) {
202 _debug("not up to date");
203 ret = afs_prepare_page(vnode, page, key, offset, to);
204 if (ret < 0) {
205 kfree(candidate);
206 _leave(" = %d [prep]", ret);
207 return ret;
208 }
209 SetPageUptodate(page);
210 }
211
212try_again:
213 index = page->index;
214 spin_lock(&vnode->writeback_lock);
215
216 /* see if this page is already pending a writeback under a suitable key
217 * - if so we can just join onto that one */
218 wb = (struct afs_writeback *) page_private(page);
219 if (wb) {
220 if (wb->key == key && wb->state == AFS_WBACK_PENDING)
221 goto subsume_in_current_wb;
222 goto flush_conflicting_wb;
223 }
224
225 if (index > 0) {
226 /* see if we can find an already pending writeback that we can
227 * append this page to */
228 list_for_each_entry(wb, &vnode->writebacks, link) {
229 if (wb->last == index - 1 && wb->key == key &&
230 wb->state == AFS_WBACK_PENDING)
231 goto append_to_previous_wb;
232 }
233 }
234
235 list_add_tail(&candidate->link, &vnode->writebacks);
236 candidate->key = key_get(key);
237 spin_unlock(&vnode->writeback_lock);
238 SetPagePrivate(page);
239 set_page_private(page, (unsigned long) candidate);
240 _leave(" = 0 [new]");
241 return 0;
242
243subsume_in_current_wb:
244 _debug("subsume");
245 ASSERTRANGE(wb->first, <=, index, <=, wb->last);
246 if (index == wb->first && offset < wb->offset_first)
247 wb->offset_first = offset;
248 if (index == wb->last && to > wb->to_last)
249 wb->to_last = to;
250 spin_unlock(&vnode->writeback_lock);
251 kfree(candidate);
252 _leave(" = 0 [sub]");
253 return 0;
254
255append_to_previous_wb:
256 _debug("append into %lx-%lx", wb->first, wb->last);
257 wb->usage++;
258 wb->last++;
259 wb->to_last = to;
260 spin_unlock(&vnode->writeback_lock);
261 SetPagePrivate(page);
262 set_page_private(page, (unsigned long) wb);
263 kfree(candidate);
264 _leave(" = 0 [app]");
265 return 0;
266
267 /* the page is currently bound to another context, so if it's dirty we
268 * need to flush it before we can use the new context */
269flush_conflicting_wb:
270 _debug("flush conflict");
271 if (wb->state == AFS_WBACK_PENDING)
272 wb->state = AFS_WBACK_CONFLICTING;
273 spin_unlock(&vnode->writeback_lock);
274 if (PageDirty(page)) {
275 ret = afs_write_back_from_locked_page(wb, page);
276 if (ret < 0) {
277 afs_put_writeback(candidate);
278 _leave(" = %d", ret);
279 return ret;
280 }
281 }
282
283 /* the page holds a ref on the writeback record */
284 afs_put_writeback(wb);
285 set_page_private(page, 0);
286 ClearPagePrivate(page);
287 goto try_again;
288}
289
290/*
291 * finalise part of a write to a page
292 */
293int afs_commit_write(struct file *file, struct page *page,
294 unsigned offset, unsigned to)
295{
296 struct afs_vnode *vnode = AFS_FS_I(file->f_dentry->d_inode);
297 loff_t i_size, maybe_i_size;
298
299 _enter("{%x:%u},{%lx},%u,%u",
300 vnode->fid.vid, vnode->fid.vnode, page->index, offset, to);
301
302 maybe_i_size = (loff_t) page->index << PAGE_SHIFT;
303 maybe_i_size += to;
304
305 i_size = i_size_read(&vnode->vfs_inode);
306 if (maybe_i_size > i_size) {
307 spin_lock(&vnode->writeback_lock);
308 i_size = i_size_read(&vnode->vfs_inode);
309 if (maybe_i_size > i_size)
310 i_size_write(&vnode->vfs_inode, maybe_i_size);
311 spin_unlock(&vnode->writeback_lock);
312 }
313
314 set_page_dirty(page);
315
316 if (PageDirty(page))
317 _debug("dirtied");
318
319 return 0;
320}
321
322/*
323 * kill all the pages in the given range
324 */
325static void afs_kill_pages(struct afs_vnode *vnode, bool error,
326 pgoff_t first, pgoff_t last)
327{
328 struct pagevec pv;
329 unsigned count, loop;
330
331 _enter("{%x:%u},%lx-%lx",
332 vnode->fid.vid, vnode->fid.vnode, first, last);
333
334 pagevec_init(&pv, 0);
335
336 do {
337 _debug("kill %lx-%lx", first, last);
338
339 count = last - first + 1;
340 if (count > PAGEVEC_SIZE)
341 count = PAGEVEC_SIZE;
342 pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping,
343 first, count, pv.pages);
344 ASSERTCMP(pv.nr, ==, count);
345
346 for (loop = 0; loop < count; loop++) {
347 ClearPageUptodate(pv.pages[loop]);
348 if (error)
349 SetPageError(pv.pages[loop]);
350 end_page_writeback(pv.pages[loop]);
351 }
352
353 __pagevec_release(&pv);
354 } while (first < last);
355
356 _leave("");
357}
358
359/*
360 * synchronously write back the locked page and any subsequent non-locked dirty
361 * pages also covered by the same writeback record
362 */
363static int afs_write_back_from_locked_page(struct afs_writeback *wb,
364 struct page *primary_page)
365{
366 struct page *pages[8], *page;
367 unsigned long count;
368 unsigned n, offset, to;
369 pgoff_t start, first, last;
370 int loop, ret;
371
372 _enter(",%lx", primary_page->index);
373
374 count = 1;
375 if (!clear_page_dirty_for_io(primary_page))
376 BUG();
377 if (test_set_page_writeback(primary_page))
378 BUG();
379
380 /* find all consecutive lockable dirty pages, stopping when we find a
381 * page that is not immediately lockable, is not dirty or is missing,
382 * or we reach the end of the range */
383 start = primary_page->index;
384 if (start >= wb->last)
385 goto no_more;
386 start++;
387 do {
388 _debug("more %lx [%lx]", start, count);
389 n = wb->last - start + 1;
390 if (n > ARRAY_SIZE(pages))
391 n = ARRAY_SIZE(pages);
392 n = find_get_pages_contig(wb->vnode->vfs_inode.i_mapping,
393 start, n, pages);
394 _debug("fgpc %u", n);
395 if (n == 0)
396 goto no_more;
397 if (pages[0]->index != start) {
398 for (n--; n >= 0; n--)
399 put_page(pages[n]);
400 goto no_more;
401 }
402
403 for (loop = 0; loop < n; loop++) {
404 page = pages[loop];
405 if (page->index > wb->last)
406 break;
407 if (TestSetPageLocked(page))
408 break;
409 if (!PageDirty(page) ||
410 page_private(page) != (unsigned long) wb) {
411 unlock_page(page);
412 break;
413 }
414 if (!clear_page_dirty_for_io(page))
415 BUG();
416 if (test_set_page_writeback(page))
417 BUG();
418 unlock_page(page);
419 put_page(page);
420 }
421 count += loop;
422 if (loop < n) {
423 for (; loop < n; loop++)
424 put_page(pages[loop]);
425 goto no_more;
426 }
427
428 start += loop;
429 } while (start <= wb->last && count < 65536);
430
431no_more:
432 /* we now have a contiguous set of dirty pages, each with writeback set
433 * and the dirty mark cleared; the first page is locked and must remain
434 * so, all the rest are unlocked */
435 first = primary_page->index;
436 last = first + count - 1;
437
438 offset = (first == wb->first) ? wb->offset_first : 0;
439 to = (last == wb->last) ? wb->to_last : PAGE_SIZE;
440
441 _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to);
442
443 ret = afs_vnode_store_data(wb, first, last, offset, to);
444 if (ret < 0) {
445 switch (ret) {
446 case -EDQUOT:
447 case -ENOSPC:
448 set_bit(AS_ENOSPC,
449 &wb->vnode->vfs_inode.i_mapping->flags);
450 break;
451 case -EROFS:
452 case -EIO:
453 case -EREMOTEIO:
454 case -EFBIG:
455 case -ENOENT:
456 case -ENOMEDIUM:
457 case -ENXIO:
458 afs_kill_pages(wb->vnode, true, first, last);
459 set_bit(AS_EIO, &wb->vnode->vfs_inode.i_mapping->flags);
460 break;
461 case -EACCES:
462 case -EPERM:
463 case -ENOKEY:
464 case -EKEYEXPIRED:
465 case -EKEYREJECTED:
466 case -EKEYREVOKED:
467 afs_kill_pages(wb->vnode, false, first, last);
468 break;
469 default:
470 break;
471 }
472 } else {
473 ret = count;
474 }
475
476 _leave(" = %d", ret);
477 return ret;
478}
479
480/*
481 * write a page back to the server
482 * - the caller locked the page for us
483 */
484int afs_writepage(struct page *page, struct writeback_control *wbc)
485{
486 struct backing_dev_info *bdi = page->mapping->backing_dev_info;
487 struct afs_writeback *wb;
488 int ret;
489
490 _enter("{%lx},", page->index);
491
492 if (wbc->sync_mode != WB_SYNC_NONE)
493 wait_on_page_writeback(page);
494
495 if (PageWriteback(page) || !PageDirty(page)) {
496 unlock_page(page);
497 return 0;
498 }
499
500 wb = (struct afs_writeback *) page_private(page);
501 ASSERT(wb != NULL);
502
503 ret = afs_write_back_from_locked_page(wb, page);
504 unlock_page(page);
505 if (ret < 0) {
506 _leave(" = %d", ret);
507 return 0;
508 }
509
510 wbc->nr_to_write -= ret;
511 if (wbc->nonblocking && bdi_write_congested(bdi))
512 wbc->encountered_congestion = 1;
513
514 _leave(" = 0");
515 return 0;
516}
517
518/*
519 * write a region of pages back to the server
520 */
521int afs_writepages_region(struct address_space *mapping,
522 struct writeback_control *wbc,
523 pgoff_t index, pgoff_t end, pgoff_t *_next)
524{
525 struct backing_dev_info *bdi = mapping->backing_dev_info;
526 struct afs_writeback *wb;
527 struct page *page;
528 int ret, n;
529
530 _enter(",,%lx,%lx,", index, end);
531
532 do {
533 n = find_get_pages_tag(mapping, &index, PAGECACHE_TAG_DIRTY,
534 1, &page);
535 if (!n)
536 break;
537
538 _debug("wback %lx", page->index);
539
540 if (page->index > end) {
541 *_next = index;
542 page_cache_release(page);
543 _leave(" = 0 [%lx]", *_next);
544 return 0;
545 }
546
547 /* at this point we hold neither mapping->tree_lock nor lock on
548 * the page itself: the page may be truncated or invalidated
549 * (changing page->mapping to NULL), or even swizzled back from
550 * swapper_space to tmpfs file mapping
551 */
552 lock_page(page);
553
554 if (page->mapping != mapping) {
555 unlock_page(page);
556 page_cache_release(page);
557 continue;
558 }
559
560 if (wbc->sync_mode != WB_SYNC_NONE)
561 wait_on_page_writeback(page);
562
563 if (PageWriteback(page) || !PageDirty(page)) {
564 unlock_page(page);
565 continue;
566 }
567
568 wb = (struct afs_writeback *) page_private(page);
569 ASSERT(wb != NULL);
570
571 spin_lock(&wb->vnode->writeback_lock);
572 wb->state = AFS_WBACK_WRITING;
573 spin_unlock(&wb->vnode->writeback_lock);
574
575 ret = afs_write_back_from_locked_page(wb, page);
576 unlock_page(page);
577 page_cache_release(page);
578 if (ret < 0) {
579 _leave(" = %d", ret);
580 return ret;
581 }
582
583 wbc->nr_to_write -= ret;
584
585 if (wbc->nonblocking && bdi_write_congested(bdi)) {
586 wbc->encountered_congestion = 1;
587 break;
588 }
589
590 cond_resched();
591 } while (index < end && wbc->nr_to_write > 0);
592
593 *_next = index;
594 _leave(" = 0 [%lx]", *_next);
595 return 0;
596}
597
598/*
599 * write some of the pending data back to the server
600 */
601int afs_writepages(struct address_space *mapping,
602 struct writeback_control *wbc)
603{
604 struct backing_dev_info *bdi = mapping->backing_dev_info;
605 pgoff_t start, end, next;
606 int ret;
607
608 _enter("");
609
610 if (wbc->nonblocking && bdi_write_congested(bdi)) {
611 wbc->encountered_congestion = 1;
612 _leave(" = 0 [congest]");
613 return 0;
614 }
615
616 if (wbc->range_cyclic) {
617 start = mapping->writeback_index;
618 end = -1;
619 ret = afs_writepages_region(mapping, wbc, start, end, &next);
620 if (start > 0 && wbc->nr_to_write > 0 && ret == 0 &&
621 !(wbc->nonblocking && wbc->encountered_congestion))
622 ret = afs_writepages_region(mapping, wbc, 0, start,
623 &next);
624 mapping->writeback_index = next;
625 } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
626 end = (pgoff_t)(LLONG_MAX >> PAGE_CACHE_SHIFT);
627 ret = afs_writepages_region(mapping, wbc, 0, end, &next);
628 if (wbc->nr_to_write > 0)
629 mapping->writeback_index = next;
630 } else {
631 start = wbc->range_start >> PAGE_CACHE_SHIFT;
632 end = wbc->range_end >> PAGE_CACHE_SHIFT;
633 ret = afs_writepages_region(mapping, wbc, start, end, &next);
634 }
635
636 _leave(" = %d", ret);
637 return ret;
638}
639
640/*
641 * write an inode back
642 */
643int afs_write_inode(struct inode *inode, int sync)
644{
645 struct afs_vnode *vnode = AFS_FS_I(inode);
646 int ret;
647
648 _enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
649
650 ret = 0;
651 if (sync) {
652 ret = filemap_fdatawait(inode->i_mapping);
653 if (ret < 0)
654 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
655 }
656
657 _leave(" = %d", ret);
658 return ret;
659}
660
661/*
662 * completion of write to server
663 */
664void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call)
665{
666 struct afs_writeback *wb = call->wb;
667 struct pagevec pv;
668 unsigned count, loop;
669 pgoff_t first = call->first, last = call->last;
670 bool free_wb;
671
672 _enter("{%x:%u},{%lx-%lx}",
673 vnode->fid.vid, vnode->fid.vnode, first, last);
674
675 ASSERT(wb != NULL);
676
677 pagevec_init(&pv, 0);
678
679 do {
680 _debug("attach %lx-%lx", first, last);
681
682 count = last - first + 1;
683 if (count > PAGEVEC_SIZE)
684 count = PAGEVEC_SIZE;
685 pv.nr = find_get_pages_contig(call->mapping, first, count,
686 pv.pages);
687 ASSERTCMP(pv.nr, ==, count);
688
689 spin_lock(&vnode->writeback_lock);
690 for (loop = 0; loop < count; loop++) {
691 struct page *page = pv.pages[loop];
692 end_page_writeback(page);
693 if (page_private(page) == (unsigned long) wb) {
694 set_page_private(page, 0);
695 ClearPagePrivate(page);
696 wb->usage--;
697 }
698 }
699 free_wb = false;
700 if (wb->usage == 0) {
701 afs_unlink_writeback(wb);
702 free_wb = true;
703 }
704 spin_unlock(&vnode->writeback_lock);
705 first += count;
706 if (free_wb) {
707 afs_free_writeback(wb);
708 wb = NULL;
709 }
710
711 __pagevec_release(&pv);
712 } while (first < last);
713
714 _leave("");
715}
716
717/*
718 * write to an AFS file
719 */
720ssize_t afs_file_write(struct kiocb *iocb, const struct iovec *iov,
721 unsigned long nr_segs, loff_t pos)
722{
723 struct dentry *dentry = iocb->ki_filp->f_path.dentry;
724 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
725 ssize_t result;
726 size_t count = iov_length(iov, nr_segs);
727 int ret;
728
729 _enter("{%x.%u},{%zu},%lu,",
730 vnode->fid.vid, vnode->fid.vnode, count, nr_segs);
731
732 if (IS_SWAPFILE(&vnode->vfs_inode)) {
733 printk(KERN_INFO
734 "AFS: Attempt to write to active swap file!\n");
735 return -EBUSY;
736 }
737
738 if (!count)
739 return 0;
740
741 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
742 if (IS_ERR_VALUE(result)) {
743 _leave(" = %zd", result);
744 return result;
745 }
746
747 /* return error values for O_SYNC and IS_SYNC() */
748 if (IS_SYNC(&vnode->vfs_inode) || iocb->ki_filp->f_flags & O_SYNC) {
749 ret = afs_fsync(iocb->ki_filp, dentry, 1);
750 if (ret < 0)
751 result = ret;
752 }
753
754 _leave(" = %zd", result);
755 return result;
756}
757
758/*
759 * flush the vnode to the fileserver
760 */
761int afs_writeback_all(struct afs_vnode *vnode)
762{
763 struct address_space *mapping = vnode->vfs_inode.i_mapping;
764 struct writeback_control wbc = {
765 .bdi = mapping->backing_dev_info,
766 .sync_mode = WB_SYNC_ALL,
767 .nr_to_write = LONG_MAX,
768 .for_writepages = 1,
769 .range_cyclic = 1,
770 };
771 int ret;
772
773 _enter("");
774
775 ret = mapping->a_ops->writepages(mapping, &wbc);
776 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
777
778 _leave(" = %d", ret);
779 return ret;
780}
781
782/*
783 * flush any dirty pages for this process, and check for write errors.
784 * - the return status from this call provides a reliable indication of
785 * whether any write errors occurred for this process.
786 */
787int afs_fsync(struct file *file, struct dentry *dentry, int datasync)
788{
789 struct afs_writeback *wb, *xwb;
790 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
791 int ret;
792
793 _enter("{%x:%u},{n=%s},%d",
794 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
795 datasync);
796
797 /* use a writeback record as a marker in the queue - when this reaches
798 * the front of the queue, all the outstanding writes are either
799 * completed or rejected */
800 wb = kzalloc(sizeof(*wb), GFP_KERNEL);
801 if (!wb)
802 return -ENOMEM;
803 wb->vnode = vnode;
804 wb->first = 0;
805 wb->last = -1;
806 wb->offset_first = 0;
807 wb->to_last = PAGE_SIZE;
808 wb->usage = 1;
809 wb->state = AFS_WBACK_SYNCING;
810 init_waitqueue_head(&wb->waitq);
811
812 spin_lock(&vnode->writeback_lock);
813 list_for_each_entry(xwb, &vnode->writebacks, link) {
814 if (xwb->state == AFS_WBACK_PENDING)
815 xwb->state = AFS_WBACK_CONFLICTING;
816 }
817 list_add_tail(&wb->link, &vnode->writebacks);
818 spin_unlock(&vnode->writeback_lock);
819
820 /* push all the outstanding writebacks to the server */
821 ret = afs_writeback_all(vnode);
822 if (ret < 0) {
823 afs_put_writeback(wb);
824 _leave(" = %d [wb]", ret);
825 return ret;
826 }
827
828 /* wait for the preceding writes to actually complete */
829 ret = wait_event_interruptible(wb->waitq,
830 wb->state == AFS_WBACK_COMPLETE ||
831 vnode->writebacks.next == &wb->link);
832 afs_put_writeback(wb);
833 _leave(" = %d", ret);
834 return ret;
835}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 06:39:30 -0400