[PATCH] ipc: convert /proc/sysvipc/* to generic seq_file interface

Change the /proc/sysvipc/shm|sem|msg files to use the generic seq_file
implementation for struct ipc_ids.

Signed-off-by: Mike Waychison <mikew@google.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 78 insertions, 163 deletions

diff --git a/ipc/msg.c b/ipc/msg.c
index 27e516f96cdc..d035bd2aba96 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -26,6 +26,7 @@
 #include <linux/sched.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
+#include <linux/seq_file.h>
 #include <asm/current.h>
 #include <asm/uaccess.h>
 #include "util.h"
@@ -74,16 +75,16 @@ static struct ipc_ids msg_ids;
 static void freeque (struct msg_queue *msq, int id);
 static int newque (key_t key, int msgflg);
 #ifdef CONFIG_PROC_FS
-static int sysvipc_msg_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data);
+static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
 #endif
 
 void __init msg_init (void)
 {
         ipc_init_ids(&msg_ids,msg_ctlmni);
-
-#ifdef CONFIG_PROC_FS
-        create_proc_read_entry("sysvipc/msg", 0, NULL, sysvipc_msg_read_proc, NULL);
-#endif
+        ipc_init_proc_interface("sysvipc/msg",
+                                "       key      msqid perms      cbytes       qnum lspid lrpid   uid   gid  cuid  cgid      stime      rtime      ctime\n",
+                                &msg_ids,
+                                sysvipc_msg_proc_show);
 }
 
 static int newque (key_t key, int msgflg)
@@ -113,6 +114,7 @@ static int newque (key_t key, int msgflg)
                 return -ENOSPC;
         }
 
+        msq->q_id = msg_buildid(id,msq->q_perm.seq);
         msq->q_stime = msq->q_rtime = 0;
         msq->q_ctime = get_seconds();
         msq->q_cbytes = msq->q_qnum = 0;
@@ -123,7 +125,7 @@ static int newque (key_t key, int msgflg)
         INIT_LIST_HEAD(&msq->q_senders);
         msg_unlock(msq);
 
-        return msg_buildid(id,msq->q_perm.seq);
+        return msq->q_id;
 }
 
 static inline void ss_add(struct msg_queue* msq, struct msg_sender* mss)
@@ -808,55 +810,25 @@ out_unlock:
 }
 
 #ifdef CONFIG_PROC_FS
-static int sysvipc_msg_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
 {
-        off_t pos = 0;
-        off_t begin = 0;
-        int i, len = 0;
-
-        down(&msg_ids.sem);
-        len += sprintf(buffer, "       key      msqid perms      cbytes       qnum lspid lrpid   uid   gid  cuid  cgid      stime      rtime      ctime\n");
-
-        for(i = 0; i <= msg_ids.max_id; i++) {
-                struct msg_queue * msq;
-                msq = msg_lock(i);
-                if(msq != NULL) {
-                        len += sprintf(buffer + len, "%10d %10d  %4o  %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
-                                msq->q_perm.key,
-                                msg_buildid(i,msq->q_perm.seq),
-                                msq->q_perm.mode,
-                                msq->q_cbytes,
-                                msq->q_qnum,
-                                msq->q_lspid,
-                                msq->q_lrpid,
-                                msq->q_perm.uid,
-                                msq->q_perm.gid,
-                                msq->q_perm.cuid,
-                                msq->q_perm.cgid,
-                                msq->q_stime,
-                                msq->q_rtime,
-                                msq->q_ctime);
-                        msg_unlock(msq);
-
-                        pos += len;
-                        if(pos < offset) {
-                                len = 0;
-                                begin = pos;
-                        }
-                        if(pos > offset + length)
-                                goto done;
-                }
-
-        }
-        *eof = 1;
-done:
-        up(&msg_ids.sem);
-        *start = buffer + (offset - begin);
-        len -= (offset - begin);
-        if(len > length)
-                len = length;
-        if(len < 0)
-                len = 0;
-        return len;
+        struct msg_queue *msq = it;
+
+        return seq_printf(s,
+                          "%10d %10d  %4o  %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
+                          msq->q_perm.key,
+                          msq->q_id,
+                          msq->q_perm.mode,
+                          msq->q_cbytes,
+                          msq->q_qnum,
+                          msq->q_lspid,
+                          msq->q_lrpid,
+                          msq->q_perm.uid,
+                          msq->q_perm.gid,
+                          msq->q_perm.cuid,
+                          msq->q_perm.cgid,
+                          msq->q_stime,
+                          msq->q_rtime,
+                          msq->q_ctime);
 }
 #endif
diff --git a/ipc/sem.c b/ipc/sem.c
index 70975ce0784a..19af028a3e38 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -73,6 +73,7 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
+#include <linux/seq_file.h>
 #include <asm/uaccess.h>
 #include "util.h"
 
@@ -89,7 +90,7 @@ static struct ipc_ids sem_ids;
 static int newary (key_t, int, int);
 static void freeary (struct sem_array *sma, int id);
 #ifdef CONFIG_PROC_FS
-static int sysvipc_sem_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data);
+static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
 #endif
 
 #define SEMMSL_FAST     256 /* 512 bytes on stack */
@@ -116,10 +117,10 @@ void __init sem_init (void)
 {
         used_sems = 0;
         ipc_init_ids(&sem_ids,sc_semmni);
-
-#ifdef CONFIG_PROC_FS
-        create_proc_read_entry("sysvipc/sem", 0, NULL, sysvipc_sem_read_proc, NULL);
-#endif
+        ipc_init_proc_interface("sysvipc/sem",
+                                "       key      semid perms      nsems   uid   gid  cuid  cgid      otime      ctime\n",
+                                &sem_ids,
+                                sysvipc_sem_proc_show);
 }
 
 /*
@@ -193,6 +194,7 @@ static int newary (key_t key, int nsems, int semflg)
         }
         used_sems += nsems;
 
+        sma->sem_id = sem_buildid(id, sma->sem_perm.seq);
         sma->sem_base = (struct sem *) &sma[1];
         /* sma->sem_pending = NULL; */
         sma->sem_pending_last = &sma->sem_pending;
@@ -201,7 +203,7 @@ static int newary (key_t key, int nsems, int semflg)
         sma->sem_ctime = get_seconds();
         sem_unlock(sma);
 
-        return sem_buildid(id, sma->sem_perm.seq);
+        return sma->sem_id;
 }
 
 asmlinkage long sys_semget (key_t key, int nsems, int semflg)
@@ -1328,50 +1330,21 @@ next_entry:
 }
 
 #ifdef CONFIG_PROC_FS
-static int sysvipc_sem_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+static int sysvipc_sem_proc_show(struct seq_file *s, void *it)
 {
-        off_t pos = 0;
-        off_t begin = 0;
-        int i, len = 0;
-
-        len += sprintf(buffer, "       key      semid perms      nsems   uid   gid  cuid  cgid      otime      ctime\n");
-        down(&sem_ids.sem);
-
-        for(i = 0; i <= sem_ids.max_id; i++) {
-                struct sem_array *sma;
-                sma = sem_lock(i);
-                if(sma) {
-                        len += sprintf(buffer + len, "%10d %10d  %4o %10lu %5u %5u %5u %5u %10lu %10lu\n",
-                                sma->sem_perm.key,
-                                sem_buildid(i,sma->sem_perm.seq),
-                                sma->sem_perm.mode,
-                                sma->sem_nsems,
-                                sma->sem_perm.uid,
-                                sma->sem_perm.gid,
-                                sma->sem_perm.cuid,
-                                sma->sem_perm.cgid,
-                                sma->sem_otime,
-                                sma->sem_ctime);
-                        sem_unlock(sma);
-
-                        pos += len;
-                        if(pos < offset) {
-                                len = 0;
-                                begin = pos;
-                        }
-                        if(pos > offset + length)
-                                goto done;
-                }
-        }
-        *eof = 1;
-done:
-        up(&sem_ids.sem);
-        *start = buffer + (offset - begin);
-        len -= (offset - begin);
-        if(len > length)
-                len = length;
-        if(len < 0)
-                len = 0;
-        return len;
+        struct sem_array *sma = it;
+
+        return seq_printf(s,
+                          "%10d %10d  %4o %10lu %5u %5u %5u %5u %10lu %10lu\n",
+                          sma->sem_perm.key,
+                          sma->sem_id,
+                          sma->sem_perm.mode,
+                          sma->sem_nsems,
+                          sma->sem_perm.uid,
+                          sma->sem_perm.gid,
+                          sma->sem_perm.cuid,
+                          sma->sem_perm.cgid,
+                          sma->sem_otime,
+                          sma->sem_ctime);
 }
 #endif
diff --git a/ipc/shm.c b/ipc/shm.c
index 1d6cf08d950b..dca90489e3b0 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -23,12 +23,12 @@
 #include <linux/init.h>
 #include <linux/file.h>
 #include <linux/mman.h>
-#include <linux/proc_fs.h>
 #include <linux/shmem_fs.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
 #include <linux/ptrace.h>
+#include <linux/seq_file.h>
 
 #include <asm/uaccess.h>
 
@@ -51,7 +51,7 @@ static int newseg (key_t key, int shmflg, size_t size);
 static void shm_open (struct vm_area_struct *shmd);
 static void shm_close (struct vm_area_struct *shmd);
 #ifdef CONFIG_PROC_FS
-static int sysvipc_shm_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data);
+static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
 #endif
 
 size_t  shm_ctlmax = SHMMAX;
@@ -63,9 +63,10 @@ static int shm_tot; /* total number of shared memory pages */
 void __init shm_init (void)
 {
         ipc_init_ids(&shm_ids, 1);
-#ifdef CONFIG_PROC_FS
-        create_proc_read_entry("sysvipc/shm", 0, NULL, sysvipc_shm_read_proc, NULL);
-#endif
+        ipc_init_proc_interface("sysvipc/shm",
+                                "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime\n",
+                                &shm_ids,
+                                sysvipc_shm_proc_show);
 }
 
 static inline int shm_checkid(struct shmid_kernel *s, int id)
@@ -869,63 +870,32 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
 }
 
 #ifdef CONFIG_PROC_FS
-static int sysvipc_shm_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
 {
-        off_t pos = 0;
-        off_t begin = 0;
-        int i, len = 0;
-
-        down(&shm_ids.sem);
-        len += sprintf(buffer, "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime\n");
+        struct shmid_kernel *shp = it;
+        char *format;
 
-        for(i = 0; i <= shm_ids.max_id; i++) {
-                struct shmid_kernel* shp;
-
-                shp = shm_lock(i);
-                if(shp!=NULL) {
 #define SMALL_STRING "%10d %10d  %4o %10u %5u %5u  %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
 #define BIG_STRING   "%10d %10d  %4o %21u %5u %5u  %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
-                        char *format;
 
-                        if (sizeof(size_t) <= sizeof(int))
-                                format = SMALL_STRING;
-                        else
-                                format = BIG_STRING;
-                        len += sprintf(buffer + len, format,
-                                shp->shm_perm.key,
-                                shm_buildid(i, shp->shm_perm.seq),
-                                shp->shm_flags,
-                                shp->shm_segsz,
-                                shp->shm_cprid,
-                                shp->shm_lprid,
-                                is_file_hugepages(shp->shm_file) ? (file_count(shp->shm_file) - 1) : shp->shm_nattch,
-                                shp->shm_perm.uid,
-                                shp->shm_perm.gid,
-                                shp->shm_perm.cuid,
-                                shp->shm_perm.cgid,
-                                shp->shm_atim,
-                                shp->shm_dtim,
-                                shp->shm_ctim);
-                        shm_unlock(shp);
-
-                        pos += len;
-                        if(pos < offset) {
-                                len = 0;
-                                begin = pos;
-                        }
-                        if(pos > offset + length)
-                                goto done;
-                }
-        }
-        *eof = 1;
-done:
-        up(&shm_ids.sem);
-        *start = buffer + (offset - begin);
-        len -= (offset - begin);
-        if(len > length)
-                len = length;
-        if(len < 0)
-                len = 0;
-        return len;
+        if (sizeof(size_t) <= sizeof(int))
+                format = SMALL_STRING;
+        else
+                format = BIG_STRING;
+        return seq_printf(s, format,
+                          shp->shm_perm.key,
+                          shp->id,
+                          shp->shm_flags,
+                          shp->shm_segsz,
+                          shp->shm_cprid,
+                          shp->shm_lprid,
+                          is_file_hugepages(shp->shm_file) ? (file_count(shp->shm_file) - 1) : shp->shm_nattch,
+                          shp->shm_perm.uid,
+                          shp->shm_perm.gid,
+                          shp->shm_perm.cuid,
+                          shp->shm_perm.cgid,
+                          shp->shm_atim,
+                          shp->shm_dtim,
+                          shp->shm_ctim);
 }
 #endif