nilfs2: fix gc failure on volumes keeping numerous snapshots

[linux-2.6-omap-h63xx.git] / fs / nilfs2 / ioctl.c

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 5ce06a01c7ec6972ac2087ceba612e0a907169c0..d9e3990f9589d45daa38d034563ee635a50efec4 100644 (file)
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -37,13 +37,14 @@
 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
                                 struct nilfs_argv *argv, int dir,
                                 ssize_t (*dofunc)(struct the_nilfs *,
-                                                  int, int,
+                                                  __u64 *, int,
                                                   void *, size_t, size_t))
 {
        void *buf;
        size_t maxmembs, total, n;
        ssize_t nr;
        int ret, i;
+       __u64 pos, ppos;
 
        if (argv->v_nmembs == 0)
                return 0;
@@ -58,6 +59,7 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 
        ret = 0;
        total = 0;
+       pos = argv->v_index;
        for (i = 0; i < argv->v_nmembs; i += n) {
                n = (argv->v_nmembs - i < maxmembs) ?
                        argv->v_nmembs - i : maxmembs;
@@ -68,8 +70,9 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
                        ret = -EFAULT;
                        break;
                }
-               nr = (*dofunc)(nilfs, argv->v_index + i, argv->v_flags, buf,
-                              argv->v_size, n);
+               ppos = pos;
+               nr = (*dofunc)(nilfs, &pos, argv->v_flags, buf, argv->v_size,
+                              n);
                if (nr < 0) {
                        ret = nr;
                        break;
@@ -82,6 +85,10 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
                        break;
                }
                total += nr;
+               if ((size_t)nr < n)
+                       break;
+               if (pos == ppos)
+                       pos += n;
        }
        argv->v_nmembs = total;
 
@@ -138,10 +145,10 @@ nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 }
 
 static ssize_t
-nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
                          void *buf, size_t size, size_t nmembs)
 {
-       return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, index, flags, buf,
+       return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
                                       nmembs);
 }
 
@@ -186,10 +193,10 @@ static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 }
 
 static ssize_t
-nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
                          void *buf, size_t size, size_t nmembs)
 {
-       return nilfs_sufile_get_suinfo(nilfs->ns_sufile, index, buf, nmembs);
+       return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
 }
 
 static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
@@ -233,7 +240,7 @@ static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 }
 
 static ssize_t
-nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
                         void *buf, size_t size, size_t nmembs)
 {
        return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
@@ -262,7 +269,7 @@ static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
 }
 
 static ssize_t
-nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
                          void *buf, size_t size, size_t nmembs)
 {
        struct inode *dat = nilfs_dat_inode(nilfs);
@@ -341,7 +348,7 @@ static int nilfs_ioctl_move_inode_block(struct inode *inode,
 }
 
 static ssize_t
-nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
                           void *buf, size_t size, size_t nmembs)
 {
        struct inode *inode;
@@ -413,7 +420,7 @@ static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
 }
 
 static ssize_t
-nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, int index,
+nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
                                  int flags, void *buf, size_t size,
                                  size_t nmembs)
 {
@@ -439,7 +446,7 @@ static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 }
 
 static ssize_t
-nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
                              void *buf, size_t size, size_t nmembs)
 {
        int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
@@ -456,8 +463,9 @@ static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 }
 
 static ssize_t
-nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, int index, int flags,
-                                void *buf, size_t size, size_t nmembs)
+nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
+                                int flags, void *buf, size_t size,
+                                size_t nmembs)
 {
        struct inode *dat = nilfs_dat_inode(nilfs);
        struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
@@ -506,7 +514,7 @@ static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 }
 
 static ssize_t
-nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
                             void *buf, size_t size, size_t nmembs)
 {
        struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);