From 0421a189bc8cdefa18a34aee962ac0558679b944 Mon Sep 17 00:00:00 2001 From: Tahsin Erdogan Date: Thu, 22 Jun 2017 10:26:31 -0400 Subject: ext4: modify ext4_xattr_ino_array to hold struct inode * Tracking struct inode * rather than the inode number eliminates the repeated ext4_xattr_inode_iget() call later. The second call cannot fail in practice but still requires explanation when it wants to ignore the return value. Avoid the trouble and make things simple. Signed-off-by: Tahsin Erdogan Signed-off-by: Theodore Ts'o --- fs/ext4/ext4.h | 6 ++-- fs/ext4/inode.c | 8 ++--- fs/ext4/xattr.c | 93 ++++++++++++++++++++++++++++----------------------------- fs/ext4/xattr.h | 5 ++-- 4 files changed, 53 insertions(+), 59 deletions(-) (limited to 'fs') diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9b6a10e1bf18..144a2863ba27 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2243,9 +2243,9 @@ struct mmpd_data { # define ATTRIB_NORET __attribute__((noreturn)) # define NORET_AND noreturn, -struct ext4_xattr_ino_array { - unsigned int xia_count; /* # of used item in the array */ - unsigned int xia_inodes[0]; +struct ext4_xattr_inode_array { + unsigned int count; /* # of used items in the array */ + struct inode *inodes[0]; }; /* bitmap.c */ extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index fda70fedf56d..1b2a68c5ea42 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -188,7 +188,7 @@ void ext4_evict_inode(struct inode *inode) handle_t *handle; int err; int extra_credits = 3; - struct ext4_xattr_ino_array *lea_ino_array = NULL; + struct ext4_xattr_inode_array *ea_inode_array = NULL; trace_ext4_evict_inode(inode); @@ -257,7 +257,7 @@ void ext4_evict_inode(struct inode *inode) /* * Delete xattr inode before deleting the main inode. */ - err = ext4_xattr_delete_inode(handle, inode, &lea_ino_array); + err = ext4_xattr_delete_inode(handle, inode, &ea_inode_array); if (err) { ext4_warning(inode->i_sb, "couldn't delete inode's xattr (err %d)", err); @@ -345,9 +345,7 @@ void ext4_evict_inode(struct inode *inode) ext4_journal_stop(handle); sb_end_intwrite(inode->i_sb); - - if (lea_ino_array != NULL) - ext4_xattr_inode_array_free(inode, lea_ino_array); + ext4_xattr_inode_array_free(ea_inode_array); return; no_delete: ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 43a2c075aa1f..fed54001c9e6 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1940,44 +1940,44 @@ cleanup: #define EIA_INCR 16 /* must be 2^n */ #define EIA_MASK (EIA_INCR - 1) -/* Add the large xattr @ino into @lea_ino_array for later deletion. - * If @lea_ino_array is new or full it will be grown and the old +/* Add the large xattr @inode into @ea_inode_array for later deletion. + * If @ea_inode_array is new or full it will be grown and the old * contents copied over. */ static int -ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino) +ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, + struct inode *inode) { - if (*lea_ino_array == NULL) { + if (*ea_inode_array == NULL) { /* * Start with 15 inodes, so it fits into a power-of-two size. - * If *lea_ino_array is NULL, this is essentially offsetof() + * If *ea_inode_array is NULL, this is essentially offsetof() */ - (*lea_ino_array) = - kmalloc(offsetof(struct ext4_xattr_ino_array, - xia_inodes[EIA_MASK]), + (*ea_inode_array) = + kmalloc(offsetof(struct ext4_xattr_inode_array, + inodes[EIA_MASK]), GFP_NOFS); - if (*lea_ino_array == NULL) + if (*ea_inode_array == NULL) return -ENOMEM; - (*lea_ino_array)->xia_count = 0; - } else if (((*lea_ino_array)->xia_count & EIA_MASK) == EIA_MASK) { + (*ea_inode_array)->count = 0; + } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { /* expand the array once all 15 + n * 16 slots are full */ - struct ext4_xattr_ino_array *new_array = NULL; - int count = (*lea_ino_array)->xia_count; + struct ext4_xattr_inode_array *new_array = NULL; + int count = (*ea_inode_array)->count; /* if new_array is NULL, this is essentially offsetof() */ new_array = kmalloc( - offsetof(struct ext4_xattr_ino_array, - xia_inodes[count + EIA_INCR]), + offsetof(struct ext4_xattr_inode_array, + inodes[count + EIA_INCR]), GFP_NOFS); if (new_array == NULL) return -ENOMEM; - memcpy(new_array, *lea_ino_array, - offsetof(struct ext4_xattr_ino_array, - xia_inodes[count])); - kfree(*lea_ino_array); - *lea_ino_array = new_array; + memcpy(new_array, *ea_inode_array, + offsetof(struct ext4_xattr_inode_array, inodes[count])); + kfree(*ea_inode_array); + *ea_inode_array = new_array; } - (*lea_ino_array)->xia_inodes[(*lea_ino_array)->xia_count++] = ino; + (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; return 0; } @@ -1985,16 +1985,16 @@ ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino) * Add xattr inode to orphan list */ static int -ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, - int credits, struct ext4_xattr_ino_array *lea_ino_array) +ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, int credits, + struct ext4_xattr_inode_array *ea_inode_array) { - struct inode *ea_inode; int idx = 0, error = 0; + struct inode *ea_inode; - if (lea_ino_array == NULL) + if (ea_inode_array == NULL) return 0; - for (; idx < lea_ino_array->xia_count; ++idx) { + for (; idx < ea_inode_array->count; ++idx) { if (!ext4_handle_has_enough_credits(handle, credits)) { error = ext4_journal_extend(handle, credits); if (error > 0) @@ -2007,10 +2007,7 @@ ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, return error; } } - error = ext4_xattr_inode_iget(inode, - lea_ino_array->xia_inodes[idx], &ea_inode); - if (error) - continue; + ea_inode = ea_inode_array->inodes[idx]; inode_lock(ea_inode); ext4_orphan_add(handle, ea_inode); inode_unlock(ea_inode); @@ -2032,13 +2029,14 @@ ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, */ int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, - struct ext4_xattr_ino_array **lea_ino_array) + struct ext4_xattr_inode_array **ea_inode_array) { struct buffer_head *bh = NULL; struct ext4_xattr_ibody_header *header; struct ext4_inode *raw_inode; struct ext4_iloc iloc; struct ext4_xattr_entry *entry; + struct inode *ea_inode; unsigned int ea_ino; int credits = 3, error = 0; @@ -2055,8 +2053,12 @@ ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, if (!entry->e_value_inum) continue; ea_ino = le32_to_cpu(entry->e_value_inum); - error = ext4_expand_ino_array(lea_ino_array, ea_ino); + error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); + if (error) + continue; + error = ext4_expand_inode_array(ea_inode_array, ea_inode); if (error) { + iput(ea_inode); brelse(iloc.bh); goto cleanup; } @@ -2068,7 +2070,7 @@ delete_external_ea: if (!EXT4_I(inode)->i_file_acl) { /* add xattr inode to orphan list */ error = ext4_xattr_inode_orphan_add(handle, inode, credits, - *lea_ino_array); + *ea_inode_array); goto cleanup; } bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); @@ -2091,7 +2093,10 @@ delete_external_ea: if (!entry->e_value_inum) continue; ea_ino = le32_to_cpu(entry->e_value_inum); - error = ext4_expand_ino_array(lea_ino_array, ea_ino); + error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); + if (error) + continue; + error = ext4_expand_inode_array(ea_inode_array, ea_inode); if (error) goto cleanup; entry->e_value_inum = 0; @@ -2099,7 +2104,7 @@ delete_external_ea: /* add xattr inode to orphan list */ error = ext4_xattr_inode_orphan_add(handle, inode, credits, - *lea_ino_array); + *ea_inode_array); if (error) goto cleanup; @@ -2126,28 +2131,20 @@ cleanup: return error; } -void -ext4_xattr_inode_array_free(struct inode *inode, - struct ext4_xattr_ino_array *lea_ino_array) +void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) { struct inode *ea_inode; int idx = 0; - int err; - if (lea_ino_array == NULL) + if (ea_inode_array == NULL) return; - for (; idx < lea_ino_array->xia_count; ++idx) { - err = ext4_xattr_inode_iget(inode, - lea_ino_array->xia_inodes[idx], &ea_inode); - if (err) - continue; - /* for inode's i_count get from ext4_xattr_delete_inode */ - iput(ea_inode); + for (; idx < ea_inode_array->count; ++idx) { + ea_inode = ea_inode_array->inodes[idx]; clear_nlink(ea_inode); iput(ea_inode); } - kfree(lea_ino_array); + kfree(ea_inode_array); } /* diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h index e82c5fe36a26..323eba54f72f 100644 --- a/fs/ext4/xattr.h +++ b/fs/ext4/xattr.h @@ -164,9 +164,8 @@ extern int ext4_xattr_set_credits(struct inode *inode, size_t value_len); extern int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino); extern int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, - struct ext4_xattr_ino_array **array); -extern void ext4_xattr_inode_array_free(struct inode *inode, - struct ext4_xattr_ino_array *array); + struct ext4_xattr_inode_array **array); +extern void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *array); extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, struct ext4_inode *raw_inode, handle_t *handle); -- cgit v1.2.3