[XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace

code.

SGI-PV: 954372
SGI-Modid: xfs-linux-melb:xfs-kern:26583a

Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 141 insertions, 40 deletions

diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index 1a2101043275..9ada7bdbae52 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -91,7 +91,6 @@ STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
 /*
  * Routines to manipulate out-of-line attribute values.
  */
-STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
 
@@ -180,7 +179,7 @@ xfs_attr_get(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
         return(error);
 }
 
-STATIC int
+int
 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
                  char *value, int valuelen, int flags)
 {
@@ -440,7 +439,7 @@ xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int f
  * Generic handler routine to remove a name from an attribute list.
  * Transitions attribute list from Btree to shortform as necessary.
  */
-STATIC int
+int
 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
 {
         xfs_da_args_t   args;
@@ -591,6 +590,110 @@ xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
         return xfs_attr_remove_int(dp, name, namelen, flags);
 }
 
+int                                                             /* error */
+xfs_attr_list_int(xfs_attr_list_context_t *context)
+{
+        int error;
+        xfs_inode_t *dp = context->dp;
+
+        /*
+         * Decide on what work routines to call based on the inode size.
+         */
+        if (XFS_IFORK_Q(dp) == 0 ||
+            (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+             dp->i_d.di_anextents == 0)) {
+                error = 0;
+        } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
+                error = xfs_attr_shortform_list(context);
+        } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+                error = xfs_attr_leaf_list(context);
+        } else {
+                error = xfs_attr_node_list(context);
+        }
+        return error;
+}
+
+#define ATTR_ENTBASESIZE                /* minimum bytes used by an attr */ \
+        (((struct attrlist_ent *) 0)->a_name - (char *) 0)
+#define ATTR_ENTSIZE(namelen)           /* actual bytes used by an attr */ \
+        ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
+         & ~(sizeof(u_int32_t)-1))
+
+/*
+ * Format an attribute and copy it out to the user's buffer.
+ * Take care to check values and protect against them changing later,
+ * we may be reading them directly out of a user buffer.
+ */
+/*ARGSUSED*/
+STATIC int
+xfs_attr_put_listent(xfs_attr_list_context_t *context, attrnames_t *namesp,
+                     char *name, int namelen,
+                     int valuelen, char *value)
+{
+        attrlist_ent_t *aep;
+        int arraytop;
+
+        ASSERT(!(context->flags & ATTR_KERNOVAL));
+        ASSERT(context->count >= 0);
+        ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
+        ASSERT(context->firstu >= sizeof(*context->alist));
+        ASSERT(context->firstu <= context->bufsize);
+
+        arraytop = sizeof(*context->alist) +
+                        context->count * sizeof(context->alist->al_offset[0]);
+        context->firstu -= ATTR_ENTSIZE(namelen);
+        if (context->firstu < arraytop) {
+                xfs_attr_trace_l_c("buffer full", context);
+                context->alist->al_more = 1;
+                context->seen_enough = 1;
+                return 1;
+        }
+
+        aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
+        aep->a_valuelen = valuelen;
+        memcpy(aep->a_name, name, namelen);
+        aep->a_name[ namelen ] = 0;
+        context->alist->al_offset[ context->count++ ] = context->firstu;
+        context->alist->al_count = context->count;
+        xfs_attr_trace_l_c("add", context);
+        return 0;
+}
+
+STATIC int
+xfs_attr_kern_list(xfs_attr_list_context_t *context, attrnames_t *namesp,
+                     char *name, int namelen,
+                     int valuelen, char *value)
+{
+        char *offset;
+        int arraytop;
+
+        ASSERT(context->count >= 0);
+
+        arraytop = context->count + namesp->attr_namelen + namelen + 1;
+        if (arraytop > context->firstu) {
+                context->count = -1;    /* insufficient space */
+                return 1;
+        }
+        offset = (char *)context->alist + context->count;
+        strncpy(offset, namesp->attr_name, namesp->attr_namelen);
+        offset += namesp->attr_namelen;
+        strncpy(offset, name, namelen);                 /* real name */
+        offset += namelen;
+        *offset = '\0';
+        context->count += namesp->attr_namelen + namelen + 1;
+        return 0;
+}
+
+/*ARGSUSED*/
+STATIC int
+xfs_attr_kern_list_sizes(xfs_attr_list_context_t *context, attrnames_t *namesp,
+                     char *name, int namelen,
+                     int valuelen, char *value)
+{
+        context->count += namesp->attr_namelen + namelen + 1;
+        return 0;
+}
+
 /*
  * Generate a list of extended attribute names and optionally
  * also value lengths.  Positive return value follows the XFS
@@ -615,13 +718,13 @@ xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
                 return(XFS_ERROR(EINVAL));
         if ((cursor->initted == 0) &&
             (cursor->hashval || cursor->blkno || cursor->offset))
-                return(XFS_ERROR(EINVAL));
+                return XFS_ERROR(EINVAL);
 
         /*
          * Check for a properly aligned buffer.
          */
         if (((long)buffer) & (sizeof(int)-1))
-                return(XFS_ERROR(EFAULT));
+                return XFS_ERROR(EFAULT);
         if (flags & ATTR_KERNOVAL)
                 bufsize = 0;
 
@@ -634,53 +737,47 @@ xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
         context.dupcnt = 0;
         context.resynch = 1;
         context.flags = flags;
-        if (!(flags & ATTR_KERNAMELS)) {
+        context.seen_enough = 0;
+        context.alist = (attrlist_t *)buffer;
+        context.put_value = 0;
+
+        if (flags & ATTR_KERNAMELS) {
+                context.bufsize = bufsize;
+                context.firstu = context.bufsize;
+                if (flags & ATTR_KERNOVAL)
+                        context.put_listent = xfs_attr_kern_list_sizes;
+                else
+                        context.put_listent = xfs_attr_kern_list;
+        } else {
                 context.bufsize = (bufsize & ~(sizeof(int)-1));  /* align */
                 context.firstu = context.bufsize;
-                context.alist = (attrlist_t *)buffer;
                 context.alist->al_count = 0;
                 context.alist->al_more = 0;
                 context.alist->al_offset[0] = context.bufsize;
-        }
-        else {
-                context.bufsize = bufsize;
-                context.firstu = context.bufsize;
-                context.alist = (attrlist_t *)buffer;
+                context.put_listent = xfs_attr_put_listent;
         }
 
         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
-                return (EIO);
+                return EIO;
 
         xfs_ilock(dp, XFS_ILOCK_SHARED);
-        /*
-         * Decide on what work routines to call based on the inode size.
-         */
         xfs_attr_trace_l_c("syscall start", &context);
-        if (XFS_IFORK_Q(dp) == 0 ||
-            (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
-             dp->i_d.di_anextents == 0)) {
-                error = 0;
-        } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
-                error = xfs_attr_shortform_list(&context);
-        } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
-                error = xfs_attr_leaf_list(&context);
-        } else {
-                error = xfs_attr_node_list(&context);
-        }
+
+        error = xfs_attr_list_int(&context);
+
         xfs_iunlock(dp, XFS_ILOCK_SHARED);
         xfs_attr_trace_l_c("syscall end", &context);
 
-        if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
-                ASSERT(error >= 0);
-        }
-        else {  /* must return negated buffer size or the error */
+        if (context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS)) {
+                /* must return negated buffer size or the error */
                 if (context.count < 0)
                         error = XFS_ERROR(ERANGE);
                 else
                         error = -context.count;
-        }
+        } else
+                ASSERT(error >= 0);
 
-        return(error);
+        return error;
 }
 
 int                                                             /* error */
@@ -1122,19 +1219,19 @@ xfs_attr_leaf_list(xfs_attr_list_context_t *context)
         context->cursor->blkno = 0;
         error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
         if (error)
-                return(error);
+                return XFS_ERROR(error);
         ASSERT(bp != NULL);
         leaf = bp->data;
         if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
                 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
                                      context->dp->i_mount, leaf);
                 xfs_da_brelse(NULL, bp);
-                return(XFS_ERROR(EFSCORRUPTED));
+                return XFS_ERROR(EFSCORRUPTED);
         }
 
-        (void)xfs_attr_leaf_list_int(bp, context);
+        error = xfs_attr_leaf_list_int(bp, context);
         xfs_da_brelse(NULL, bp);
-        return(0);
+        return XFS_ERROR(error);
 }
 
 
@@ -1858,8 +1955,12 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
                         return(XFS_ERROR(EFSCORRUPTED));
                 }
                 error = xfs_attr_leaf_list_int(bp, context);
-                if (error || !leaf->hdr.info.forw)
-                        break;  /* not really an error, buffer full or EOF */
+                if (error) {
+                        xfs_da_brelse(NULL, bp);
+                        return error;
+                }
+                if (context->seen_enough || leaf->hdr.info.forw == 0)
+                        break;
                 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
                 xfs_da_brelse(NULL, bp);
                 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
@@ -1886,7 +1987,7 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
  * Read the value associated with an attribute from the out-of-line buffer
  * that we stored it in.
  */
-STATIC int
+int
 xfs_attr_rmtval_get(xfs_da_args_t *args)
 {
         xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];