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Subject[PATCH 02/19] Unionfs: add un/likely on conditionals
Date
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
fs/unionfs/commonfops.c | 34 +++++++-------
fs/unionfs/copyup.c | 18 ++++----
fs/unionfs/debug.c | 108 +++++++++++++++++++++++++----------------------
fs/unionfs/dentry.c | 25 ++++++-----
fs/unionfs/dirfops.c | 6 +-
fs/unionfs/dirhelper.c | 6 +-
fs/unionfs/fanout.h | 6 +-
fs/unionfs/file.c | 16 ++++----
fs/unionfs/inode.c | 42 +++++++++---------
fs/unionfs/lookup.c | 12 +++---
fs/unionfs/main.c | 26 ++++++------
fs/unionfs/mmap.c | 4 +-
fs/unionfs/rdstate.c | 8 ++--
fs/unionfs/rename.c | 14 +++---
fs/unionfs/subr.c | 8 ++--
fs/unionfs/super.c | 24 +++++-----
fs/unionfs/unlink.c | 4 +-
fs/unionfs/xattr.c | 10 ++--
18 files changed, 189 insertions(+), 182 deletions(-)

diff --git a/fs/unionfs/commonfops.c b/fs/unionfs/commonfops.c
index e69ccf6..8550a34 100644
--- a/fs/unionfs/commonfops.c
+++ b/fs/unionfs/commonfops.c
@@ -74,7 +74,7 @@ retry:
err = copyup_named_file(dentry->d_parent->d_inode, file, name, bstart,
bindex, file->f_path.dentry->d_inode->i_size);
if (err) {
- if (err == -EEXIST)
+ if (unlikely(err == -EEXIST))
goto retry;
goto out;
}
@@ -126,7 +126,7 @@ static void cleanup_file(struct file *file)
*/
old_bid = UNIONFS_F(file)->saved_branch_ids[bindex];
i = branch_id_to_idx(sb, old_bid);
- if (i < 0) {
+ if (unlikely(i < 0)) {
printk(KERN_ERR "unionfs: no superblock for "
"file %p\n", file);
continue;
@@ -317,8 +317,8 @@ int unionfs_file_revalidate(struct file *file, bool willwrite)
* First revalidate the dentry inside struct file,
* but not unhashed dentries.
*/
- if (!d_deleted(dentry) &&
- !__unionfs_d_revalidate_chain(dentry, NULL, willwrite)) {
+ if (unlikely(!d_deleted(dentry) &&
+ !__unionfs_d_revalidate_chain(dentry, NULL, willwrite))) {
err = -ESTALE;
goto out_nofree;
}
@@ -335,8 +335,8 @@ int unionfs_file_revalidate(struct file *file, bool willwrite)
* someone has copied up this file from underneath us, we also need
* to refresh things.
*/
- if (!d_deleted(dentry) &&
- (sbgen > fgen || dbstart(dentry) != fbstart(file))) {
+ if (unlikely(!d_deleted(dentry) &&
+ (sbgen > fgen || dbstart(dentry) != fbstart(file)))) {
/* save orig branch ID */
int orig_brid = UNIONFS_F(file)->saved_branch_ids[fbstart(file)];

@@ -349,13 +349,13 @@ int unionfs_file_revalidate(struct file *file, bool willwrite)

size = sizeof(struct file *) * sbmax(sb);
UNIONFS_F(file)->lower_files = kzalloc(size, GFP_KERNEL);
- if (!UNIONFS_F(file)->lower_files) {
+ if (unlikely(!UNIONFS_F(file)->lower_files)) {
err = -ENOMEM;
goto out;
}
size = sizeof(int) * sbmax(sb);
UNIONFS_F(file)->saved_branch_ids = kzalloc(size, GFP_KERNEL);
- if (!UNIONFS_F(file)->saved_branch_ids) {
+ if (unlikely(!UNIONFS_F(file)->saved_branch_ids)) {
err = -ENOMEM;
goto out;
}
@@ -373,7 +373,7 @@ int unionfs_file_revalidate(struct file *file, bool willwrite)
goto out;
new_brid = UNIONFS_F(file)->
saved_branch_ids[fbstart(file)];
- if (new_brid != orig_brid && sbgen > fgen) {
+ if (unlikely(new_brid != orig_brid && sbgen > fgen)) {
/*
* If we re-opened the file on a different
* branch than the original one, and this
@@ -520,7 +520,7 @@ int unionfs_open(struct inode *inode, struct file *file)

file->private_data =
kzalloc(sizeof(struct unionfs_file_info), GFP_KERNEL);
- if (!UNIONFS_F(file)) {
+ if (unlikely(!UNIONFS_F(file))) {
err = -ENOMEM;
goto out_nofree;
}
@@ -531,13 +531,13 @@ int unionfs_open(struct inode *inode, struct file *file)

size = sizeof(struct file *) * sbmax(inode->i_sb);
UNIONFS_F(file)->lower_files = kzalloc(size, GFP_KERNEL);
- if (!UNIONFS_F(file)->lower_files) {
+ if (unlikely(!UNIONFS_F(file)->lower_files)) {
err = -ENOMEM;
goto out;
}
size = sizeof(int) * sbmax(inode->i_sb);
UNIONFS_F(file)->saved_branch_ids = kzalloc(size, GFP_KERNEL);
- if (!UNIONFS_F(file)->saved_branch_ids) {
+ if (unlikely(!UNIONFS_F(file)->saved_branch_ids)) {
err = -ENOMEM;
goto out;
}
@@ -612,7 +612,7 @@ int unionfs_file_release(struct inode *inode, struct file *file)
* This is important for open-but-unlinked files, as well as mmap
* support.
*/
- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);
fileinfo = UNIONFS_F(file);
@@ -716,7 +716,7 @@ static int unionfs_ioctl_queryfile(struct file *file, unsigned int cmd,
lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
if (!lower_dentry)
continue;
- if (lower_dentry->d_inode)
+ if (likely(lower_dentry->d_inode))
FD_SET(bindex, &branchlist);
/* purge any lower objects after partial_lookup */
if (bindex < orig_bstart || bindex > orig_bend) {
@@ -739,7 +739,7 @@ static int unionfs_ioctl_queryfile(struct file *file, unsigned int cmd,
ibend(dentry->d_inode) = orig_bend;

err = copy_to_user((void __user *)arg, &branchlist, sizeof(fd_set));
- if (err)
+ if (unlikely(err))
err = -EFAULT;

out:
@@ -753,7 +753,7 @@ long unionfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

unionfs_read_lock(file->f_path.dentry->d_sb);

- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;

/* check if asked for local commands */
@@ -791,7 +791,7 @@ int unionfs_flush(struct file *file, fl_owner_t id)

unionfs_read_lock(dentry->d_sb);

- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);

diff --git a/fs/unionfs/copyup.c b/fs/unionfs/copyup.c
index 23ac4c8..4eb5f82 100644
--- a/fs/unionfs/copyup.c
+++ b/fs/unionfs/copyup.c
@@ -43,7 +43,7 @@ static int copyup_xattrs(struct dentry *old_lower_dentry,

/* allocate space for the actual list */
name_list = unionfs_xattr_alloc(list_size + 1, XATTR_LIST_MAX);
- if (!name_list || IS_ERR(name_list)) {
+ if (unlikely(!name_list || IS_ERR(name_list))) {
err = PTR_ERR(name_list);
goto out;
}
@@ -59,7 +59,7 @@ static int copyup_xattrs(struct dentry *old_lower_dentry,

/* allocate space to hold each xattr's value */
attr_value = unionfs_xattr_alloc(XATTR_SIZE_MAX, XATTR_SIZE_MAX);
- if (!attr_value || IS_ERR(attr_value)) {
+ if (unlikely(!attr_value || IS_ERR(attr_value))) {
err = PTR_ERR(name_list);
goto out;
}
@@ -198,7 +198,7 @@ static int __copyup_ndentry(struct dentry *old_lower_dentry,
} else if (S_ISREG(old_mode)) {
struct nameidata nd;
err = init_lower_nd(&nd, LOOKUP_CREATE);
- if (err < 0)
+ if (unlikely(err < 0))
goto out;
args.create.nd = &nd;
args.create.parent = new_lower_parent_dentry->d_inode;
@@ -245,7 +245,7 @@ static int __copyup_reg_data(struct dentry *dentry,
err = PTR_ERR(input_file);
goto out;
}
- if (!input_file->f_op || !input_file->f_op->read) {
+ if (unlikely(!input_file->f_op || !input_file->f_op->read)) {
err = -EINVAL;
goto out_close_in;
}
@@ -260,14 +260,14 @@ static int __copyup_reg_data(struct dentry *dentry,
err = PTR_ERR(output_file);
goto out_close_in2;
}
- if (!output_file->f_op || !output_file->f_op->write) {
+ if (unlikely(!output_file->f_op || !output_file->f_op->write)) {
err = -EINVAL;
goto out_close_out;
}

/* allocating a buffer */
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!buf) {
+ if (unlikely(!buf)) {
err = -ENOMEM;
goto out_close_out;
}
@@ -412,7 +412,7 @@ int copyup_dentry(struct inode *dir, struct dentry *dentry, int bstart,
if (S_ISLNK(old_lower_dentry->d_inode->i_mode)) {

symbuf = kmalloc(PATH_MAX, GFP_KERNEL);
- if (!symbuf) {
+ if (unlikely(!symbuf)) {
__clear(dentry, old_lower_dentry,
old_bstart, old_bend,
new_lower_dentry, new_bindex);
@@ -692,7 +692,7 @@ struct dentry *create_parents(struct inode *dir, struct dentry *dentry,
/* There is no sense allocating any less than the minimum. */
nr_dentry = 1;
path = kmalloc(nr_dentry * sizeof(struct dentry *), GFP_KERNEL);
- if (!path)
+ if (unlikely(!path))
goto out;

/* assume the negative dentry of unionfs as the parent dentry */
@@ -725,7 +725,7 @@ struct dentry *create_parents(struct inode *dir, struct dentry *dentry,
nr_dentry *= 2;
p = krealloc(path, nr_dentry * sizeof(struct dentry *),
GFP_KERNEL);
- if (!p) {
+ if (unlikely(!p)) {
lower_dentry = ERR_PTR(-ENOMEM);
goto out;
}
diff --git a/fs/unionfs/debug.c b/fs/unionfs/debug.c
index 224773e..b103eb9 100644
--- a/fs/unionfs/debug.c
+++ b/fs/unionfs/debug.c
@@ -49,19 +49,19 @@ void __unionfs_check_inode(const struct inode *inode,
sb = inode->i_sb;
istart = ibstart(inode);
iend = ibend(inode);
- if (istart > iend) {
+ if (unlikely(istart > iend)) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci0: inode=%p istart/end=%d:%d\n",
inode, istart, iend);
}
- if ((istart == -1 && iend != -1) ||
- (istart != -1 && iend == -1)) {
+ if (unlikely((istart == -1 && iend != -1) ||
+ (istart != -1 && iend == -1))) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci1: inode=%p istart/end=%d:%d\n",
inode, istart, iend);
}
if (!S_ISDIR(inode->i_mode)) {
- if (iend != istart) {
+ if (unlikely(iend != istart)) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci2: inode=%p istart=%d iend=%d\n",
inode, istart, iend);
@@ -69,12 +69,12 @@ void __unionfs_check_inode(const struct inode *inode,
}

for (bindex = sbstart(sb); bindex < sbmax(sb); bindex++) {
- if (!UNIONFS_I(inode)) {
+ if (unlikely(!UNIONFS_I(inode))) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci3: no inode_info %p\n", inode);
return;
}
- if (!UNIONFS_I(inode)->lower_inodes) {
+ if (unlikely(!UNIONFS_I(inode)->lower_inodes)) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci4: no lower_inodes %p\n", inode);
return;
@@ -82,12 +82,12 @@ void __unionfs_check_inode(const struct inode *inode,
lower_inode = unionfs_lower_inode_idx(inode, bindex);
if (lower_inode) {
memset(&poison_ptr, POISON_INUSE, sizeof(void *));
- if (bindex < istart || bindex > iend) {
+ if (unlikely(bindex < istart || bindex > iend)) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci5: inode/linode=%p:%p bindex=%d "
"istart/end=%d:%d\n", inode,
lower_inode, bindex, istart, iend);
- } else if (lower_inode == poison_ptr) {
+ } else if (unlikely(lower_inode == poison_ptr)) {
/* freed inode! */
PRINT_CALLER(fname, fxn, line);
printk(" Ci6: inode/linode=%p:%p bindex=%d "
@@ -101,8 +101,9 @@ void __unionfs_check_inode(const struct inode *inode,
* b/t start/end, but NOT if at the
* start/end range.
*/
- if (!(S_ISDIR(inode->i_mode) &&
- bindex > istart && bindex < iend)) {
+ if (unlikely(!(S_ISDIR(inode->i_mode) &&
+ bindex > istart &&
+ bindex < iend))) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci7: inode/linode=%p:%p "
"bindex=%d istart/end=%d:%d\n",
@@ -133,8 +134,8 @@ void __unionfs_check_dentry(const struct dentry *dentry,
dend = dbend(dentry);
BUG_ON(dstart > dend);

- if ((dstart == -1 && dend != -1) ||
- (dstart != -1 && dend == -1)) {
+ if (unlikely((dstart == -1 && dend != -1) ||
+ (dstart != -1 && dend == -1))) {
PRINT_CALLER(fname, fxn, line);
printk(" CD0: dentry=%p dstart/end=%d:%d\n",
dentry, dstart, dend);
@@ -146,7 +147,7 @@ void __unionfs_check_dentry(const struct dentry *dentry,
for (bindex = sbstart(sb); bindex < sbmax(sb); bindex++) {
lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
if (lower_dentry) {
- if (bindex < dstart || bindex > dend) {
+ if (unlikely(bindex < dstart || bindex > dend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CD1: dentry/lower=%p:%p(%p) "
"bindex=%d dstart/end=%d:%d\n",
@@ -164,10 +165,10 @@ void __unionfs_check_dentry(const struct dentry *dentry,
* however, if this is a NULL dentry or a
* deleted dentry.
*/
- if (!d_deleted((struct dentry *) dentry) &&
- inode &&
- !(inode && S_ISDIR(inode->i_mode) &&
- bindex > dstart && bindex < dend)) {
+ if (unlikely(!d_deleted((struct dentry *) dentry) &&
+ inode &&
+ !(inode && S_ISDIR(inode->i_mode) &&
+ bindex > dstart && bindex < dend))) {
PRINT_CALLER(fname, fxn, line);
printk(" CD2: dentry/lower=%p:%p(%p) "
"bindex=%d dstart/end=%d:%d\n",
@@ -185,7 +186,7 @@ void __unionfs_check_dentry(const struct dentry *dentry,
for (bindex = sbstart(sb); bindex < sbmax(sb); bindex++) {
lower_mnt = unionfs_lower_mnt_idx(dentry, bindex);
if (lower_mnt) {
- if (bindex < dstart || bindex > dend) {
+ if (unlikely(bindex < dstart || bindex > dend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CM0: dentry/lmnt=%p:%p bindex=%d "
"dstart/end=%d:%d\n", dentry,
@@ -199,9 +200,9 @@ void __unionfs_check_dentry(const struct dentry *dentry,
* start/end range. Ignore this rule,
* however, if this is a NULL dentry.
*/
- if (inode &&
- !(inode && S_ISDIR(inode->i_mode) &&
- bindex > dstart && bindex < dend)) {
+ if (unlikely(inode &&
+ !(inode && S_ISDIR(inode->i_mode) &&
+ bindex > dstart && bindex < dend))) {
PRINT_CALLER(fname, fxn, line);
printk(" CM1: dentry/lmnt=%p:%p "
"bindex=%d dstart/end=%d:%d\n",
@@ -218,30 +219,30 @@ void __unionfs_check_dentry(const struct dentry *dentry,
istart = ibstart(inode);
iend = ibend(inode);
BUG_ON(istart > iend);
- if ((istart == -1 && iend != -1) ||
- (istart != -1 && iend == -1)) {
+ if (unlikely((istart == -1 && iend != -1) ||
+ (istart != -1 && iend == -1))) {
PRINT_CALLER(fname, fxn, line);
printk(" CI0: dentry/inode=%p:%p istart/end=%d:%d\n",
dentry, inode, istart, iend);
}
- if (istart != dstart) {
+ if (unlikely(istart != dstart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CI1: dentry/inode=%p:%p istart=%d dstart=%d\n",
dentry, inode, istart, dstart);
}
- if (iend != dend) {
+ if (unlikely(iend != dend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CI2: dentry/inode=%p:%p iend=%d dend=%d\n",
dentry, inode, iend, dend);
}

if (!S_ISDIR(inode->i_mode)) {
- if (dend != dstart) {
+ if (unlikely(dend != dstart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CI3: dentry/inode=%p:%p dstart=%d dend=%d\n",
dentry, inode, dstart, dend);
}
- if (iend != istart) {
+ if (unlikely(iend != istart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CI4: dentry/inode=%p:%p istart=%d iend=%d\n",
dentry, inode, istart, iend);
@@ -252,12 +253,12 @@ void __unionfs_check_dentry(const struct dentry *dentry,
lower_inode = unionfs_lower_inode_idx(inode, bindex);
if (lower_inode) {
memset(&poison_ptr, POISON_INUSE, sizeof(void *));
- if (bindex < istart || bindex > iend) {
+ if (unlikely(bindex < istart || bindex > iend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CI5: dentry/linode=%p:%p bindex=%d "
"istart/end=%d:%d\n", dentry,
lower_inode, bindex, istart, iend);
- } else if (lower_inode == poison_ptr) {
+ } else if (unlikely(lower_inode == poison_ptr)) {
/* freed inode! */
PRINT_CALLER(fname, fxn, line);
printk(" CI6: dentry/linode=%p:%p bindex=%d "
@@ -271,8 +272,9 @@ void __unionfs_check_dentry(const struct dentry *dentry,
* b/t start/end, but NOT if at the
* start/end range.
*/
- if (!(S_ISDIR(inode->i_mode) &&
- bindex > istart && bindex < iend)) {
+ if (unlikely(!(S_ISDIR(inode->i_mode) &&
+ bindex > istart &&
+ bindex < iend))) {
PRINT_CALLER(fname, fxn, line);
printk(" CI7: dentry/linode=%p:%p "
"bindex=%d istart/end=%d:%d\n",
@@ -294,8 +296,10 @@ void __unionfs_check_dentry(const struct dentry *dentry,
lower_dentry = unionfs_lower_dentry_idx(dentry,
bindex);
lower_mnt = unionfs_lower_mnt_idx(dentry, bindex);
- if (!((lower_inode && lower_dentry && lower_mnt) ||
- (!lower_inode && !lower_dentry && !lower_mnt))) {
+ if (unlikely(!((lower_inode && lower_dentry &&
+ lower_mnt) ||
+ (!lower_inode &&
+ !lower_dentry && !lower_mnt)))) {
PRINT_CALLER(fname, fxn, line);
printk(" Cx: lmnt/ldentry/linode=%p:%p:%p "
"bindex=%d dstart/end=%d:%d\n",
@@ -304,11 +308,11 @@ void __unionfs_check_dentry(const struct dentry *dentry,
}
}
/* check if lower inode is newer than upper one (it shouldn't) */
- if (is_newer_lower(dentry)) {
+ if (unlikely(is_newer_lower(dentry))) {
PRINT_CALLER(fname, fxn, line);
for (bindex=ibstart(inode); bindex <= ibend(inode); bindex++) {
lower_inode = unionfs_lower_inode_idx(inode, bindex);
- if (!lower_inode)
+ if (unlikely(!lower_inode))
continue;
printk(" CI8: bindex=%d mtime/lmtime=%lu.%lu/%lu.%lu "
"ctime/lctime=%lu.%lu/%lu.%lu\n",
@@ -346,30 +350,30 @@ void __unionfs_check_file(const struct file *file,
fend = fbend(file);
BUG_ON(fstart > fend);

- if ((fstart == -1 && fend != -1) ||
- (fstart != -1 && fend == -1)) {
+ if (unlikely((fstart == -1 && fend != -1) ||
+ (fstart != -1 && fend == -1))) {
PRINT_CALLER(fname, fxn, line);
printk(" CF0: file/dentry=%p:%p fstart/end=%d:%d\n",
file, dentry, fstart, fend);
}
- if (fstart != dstart) {
+ if (unlikely(fstart != dstart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CF1: file/dentry=%p:%p fstart=%d dstart=%d\n",
file, dentry, fstart, dstart);
}
- if (fend != dend) {
+ if (unlikely(fend != dend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CF2: file/dentry=%p:%p fend=%d dend=%d\n",
file, dentry, fend, dend);
}
inode = dentry->d_inode;
if (!S_ISDIR(inode->i_mode)) {
- if (fend != fstart) {
+ if (unlikely(fend != fstart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CF3: file/inode=%p:%p fstart=%d fend=%d\n",
file, inode, fstart, fend);
}
- if (dend != dstart) {
+ if (unlikely(dend != dstart)) {
PRINT_CALLER(fname, fxn, line);
printk(" CF4: file/dentry=%p:%p dstart=%d dend=%d\n",
file, dentry, dstart, dend);
@@ -383,7 +387,7 @@ void __unionfs_check_file(const struct file *file,
for (bindex = sbstart(sb); bindex < sbmax(sb); bindex++) {
lower_file = unionfs_lower_file_idx(file, bindex);
if (lower_file) {
- if (bindex < fstart || bindex > fend) {
+ if (unlikely(bindex < fstart || bindex > fend)) {
PRINT_CALLER(fname, fxn, line);
printk(" CF5: file/lower=%p:%p bindex=%d "
"fstart/end=%d:%d\n",
@@ -396,8 +400,9 @@ void __unionfs_check_file(const struct file *file,
* b/t start/end, but NOT if at the
* start/end range.
*/
- if (!(S_ISDIR(inode->i_mode) &&
- bindex > fstart && bindex < fend)) {
+ if (unlikely(!(S_ISDIR(inode->i_mode) &&
+ bindex > fstart &&
+ bindex < fend))) {
PRINT_CALLER(fname, fxn, line);
printk(" CF6: file/lower=%p:%p "
"bindex=%d fstart/end=%d:%d\n",
@@ -417,12 +422,13 @@ void __unionfs_check_nd(const struct nameidata *nd,
struct file *file;
int printed_caller = 0;

- if (!nd)
+ if (unlikely(!nd))
return;
if (nd->flags & LOOKUP_OPEN) {
file = nd->intent.open.file;
- if (file->f_path.dentry &&
- strcmp(file->f_dentry->d_sb->s_type->name, "unionfs")) {
+ if (unlikely(file->f_path.dentry &&
+ strcmp(file->f_dentry->d_sb->s_type->name,
+ "unionfs"))) {
PRINT_CALLER(fname, fxn, line);
printk(" CND1: lower_file of type %s\n",
file->f_path.dentry->d_sb->s_type->name);
@@ -440,7 +446,7 @@ void __show_branch_counts(const struct super_block *sb,

printk("BC:");
for (i=0; i<sbmax(sb); i++) {
- if (sb->s_root)
+ if (likely(sb->s_root))
mnt = UNIONFS_D(sb->s_root)->lower_paths[i].mnt;
else
mnt = NULL;
@@ -457,7 +463,7 @@ void __show_inode_times(const struct inode *inode,

for (bindex=ibstart(inode); bindex <= ibend(inode); bindex++) {
lower_inode = unionfs_lower_inode_idx(inode, bindex);
- if (!lower_inode)
+ if (unlikely(!lower_inode))
continue;
printk("IT(%lu:%d): ", inode->i_ino, bindex);
printk("%s:%s:%d ",file,fxn,line);
@@ -503,14 +509,14 @@ void __show_inode_counts(const struct inode *inode,
struct inode *lower_inode;
int bindex;

- if (!inode) {
+ if (unlikely(!inode)) {
printk("SiC: Null inode\n");
return;
}
for (bindex=sbstart(inode->i_sb); bindex <= sbend(inode->i_sb);
bindex++) {
lower_inode = unionfs_lower_inode_idx(inode, bindex);
- if (!lower_inode)
+ if (unlikely(!lower_inode))
continue;
printk("SIC(%lu:%d:%d): ", inode->i_ino, bindex,
atomic_read(&(inode)->i_count));
diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index 52bcb18..89f6a91 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -62,7 +62,7 @@ static bool __unionfs_d_revalidate_one(struct dentry *dentry,
* revalidation to be done, because this file does not exist within
* the namespace, and Unionfs operates on the namespace, not data.
*/
- if (sbgen != dgen) {
+ if (unlikely(sbgen != dgen)) {
struct dentry *result;
int pdgen;

@@ -138,7 +138,7 @@ static bool __unionfs_d_revalidate_one(struct dentry *dentry,
dentry = result;
}

- if (positive && UNIONFS_I(dentry->d_inode)->stale) {
+ if (unlikely(positive && UNIONFS_I(dentry->d_inode)->stale)) {
make_bad_inode(dentry->d_inode);
d_drop(dentry);
valid = false;
@@ -216,16 +216,16 @@ bool is_newer_lower(const struct dentry *dentry)
* lower inode's data has changed, but checking for changed
* ctime and mtime on the lower inode should be enough.
*/
- if (timespec_compare(&inode->i_mtime,
- &lower_inode->i_mtime) < 0) {
+ if (unlikely(timespec_compare(&inode->i_mtime,
+ &lower_inode->i_mtime) < 0)) {
printk("unionfs: new lower inode mtime "
"(bindex=%d, name=%s)\n", bindex,
dentry->d_name.name);
show_dinode_times(dentry);
return true; /* mtime changed! */
}
- if (timespec_compare(&inode->i_ctime,
- &lower_inode->i_ctime) < 0) {
+ if (unlikely(timespec_compare(&inode->i_ctime,
+ &lower_inode->i_ctime) < 0)) {
printk("unionfs: new lower inode ctime "
"(bindex=%d, name=%s)\n", bindex,
dentry->d_name.name);
@@ -293,7 +293,7 @@ bool __unionfs_d_revalidate_chain(struct dentry *dentry, struct nameidata *nd,
dtmp = dentry->d_parent;
dgen = atomic_read(&UNIONFS_D(dtmp)->generation);
/* XXX: should we check if is_newer_lower all the way up? */
- if (is_newer_lower(dtmp)) {
+ if (unlikely(is_newer_lower(dtmp))) {
/*
* Special case: the root dentry's generation number must
* always be valid, but its lower inode times don't have to
@@ -327,7 +327,7 @@ bool __unionfs_d_revalidate_chain(struct dentry *dentry, struct nameidata *nd,
* and short lived, so locality will be better.
*/
chain = kzalloc(chain_len * sizeof(struct dentry *), GFP_KERNEL);
- if (!chain) {
+ if (unlikely(!chain)) {
printk("unionfs: no more memory in %s\n", __FUNCTION__);
goto out;
}
@@ -364,7 +364,7 @@ bool __unionfs_d_revalidate_chain(struct dentry *dentry, struct nameidata *nd,
}
unionfs_unlock_dentry(chain[i]);

- if (!valid)
+ if (unlikely(!valid))
goto out_free;
}

@@ -373,7 +373,8 @@ out_this:
/* finally, lock this dentry and revalidate it */
verify_locked(dentry);
dgen = atomic_read(&UNIONFS_D(dentry)->generation);
- if (is_newer_lower(dentry)) {
+
+ if (unlikely(is_newer_lower(dentry))) {
/* root dentry special case as aforementioned */
if (IS_ROOT(dentry))
unionfs_copy_attr_times(dentry->d_inode);
@@ -425,7 +426,7 @@ static int unionfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
unionfs_lock_dentry(dentry);
err = __unionfs_d_revalidate_chain(dentry, nd, false);
unionfs_unlock_dentry(dentry);
- if (err > 0) { /* true==1: dentry is valid */
+ if (likely(err > 0)) { /* true==1: dentry is valid */
unionfs_check_dentry(dentry);
unionfs_check_nd(nd);
}
@@ -447,7 +448,7 @@ static void unionfs_d_release(struct dentry *dentry)

unionfs_check_dentry(dentry);
/* this could be a negative dentry, so check first */
- if (!UNIONFS_D(dentry)) {
+ if (unlikely(!UNIONFS_D(dentry))) {
printk(KERN_DEBUG "unionfs: dentry without private data: %.*s\n",
dentry->d_name.len, dentry->d_name.name);
goto out;
diff --git a/fs/unionfs/dirfops.c b/fs/unionfs/dirfops.c
index c923e58..200fb55 100644
--- a/fs/unionfs/dirfops.c
+++ b/fs/unionfs/dirfops.c
@@ -99,7 +99,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)

unionfs_read_lock(file->f_path.dentry->d_sb);

- if ((err = unionfs_file_revalidate(file, false)))
+ if (unlikely((err = unionfs_file_revalidate(file, false))))
goto out;

inode = file->f_path.dentry->d_inode;
@@ -110,7 +110,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
goto out;
} else if (file->f_pos > 0) {
uds = find_rdstate(inode, file->f_pos);
- if (!uds) {
+ if (unlikely(!uds)) {
err = -ESTALE;
goto out;
}
@@ -201,7 +201,7 @@ static loff_t unionfs_dir_llseek(struct file *file, loff_t offset, int origin)

unionfs_read_lock(file->f_path.dentry->d_sb);

- if ((err = unionfs_file_revalidate(file, false)))
+ if (unlikely((err = unionfs_file_revalidate(file, false))))
goto out;

rdstate = UNIONFS_F(file)->rdstate;
diff --git a/fs/unionfs/dirhelper.c b/fs/unionfs/dirhelper.c
index a72f711..f0e1fee 100644
--- a/fs/unionfs/dirhelper.c
+++ b/fs/unionfs/dirhelper.c
@@ -43,7 +43,7 @@ int do_delete_whiteouts(struct dentry *dentry, int bindex,

err = -ENOMEM;
name = __getname();
- if (!name)
+ if (unlikely(!name))
goto out;
strcpy(name, UNIONFS_WHPFX);
p = name + UNIONFS_WHLEN;
@@ -204,14 +204,14 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
bend = bopaque;

buf = kmalloc(sizeof(struct unionfs_rdutil_callback), GFP_KERNEL);
- if (!buf) {
+ if (unlikely(!buf)) {
err = -ENOMEM;
goto out;
}
buf->err = 0;
buf->mode = RD_CHECK_EMPTY;
buf->rdstate = alloc_rdstate(dentry->d_inode, bstart);
- if (!buf->rdstate) {
+ if (unlikely(!buf->rdstate)) {
err = -ENOMEM;
goto out;
}
diff --git a/fs/unionfs/fanout.h b/fs/unionfs/fanout.h
index 51aa0de..536a51f 100644
--- a/fs/unionfs/fanout.h
+++ b/fs/unionfs/fanout.h
@@ -314,11 +314,11 @@ static inline void unionfs_copy_attr_times(struct inode *upper)
lower = unionfs_lower_inode_idx(upper, bindex);
if (!lower)
continue; /* not all lower dir objects may exist */
- if (timespec_compare(&upper->i_mtime, &lower->i_mtime) < 0)
+ if (unlikely(timespec_compare(&upper->i_mtime, &lower->i_mtime) < 0))
upper->i_mtime = lower->i_mtime;
- if (timespec_compare(&upper->i_ctime, &lower->i_ctime) < 0)
+ if (unlikely(timespec_compare(&upper->i_ctime, &lower->i_ctime) < 0))
upper->i_ctime = lower->i_ctime;
- if (timespec_compare(&upper->i_atime, &lower->i_atime) < 0)
+ if (unlikely(timespec_compare(&upper->i_atime, &lower->i_atime) < 0))
upper->i_atime = lower->i_atime;
}
}
diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
index d8eaaa5..82959d1 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -24,7 +24,7 @@ static ssize_t unionfs_read(struct file *file, char __user *buf,
int err;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, false)))
+ if (unlikely((err = unionfs_file_revalidate(file, false))))
goto out;
unionfs_check_file(file);

@@ -47,7 +47,7 @@ static ssize_t unionfs_aio_read(struct kiocb *iocb, const struct iovec *iov,
struct file *file = iocb->ki_filp;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, false)))
+ if (unlikely((err = unionfs_file_revalidate(file, false))))
goto out;
unionfs_check_file(file);

@@ -72,7 +72,7 @@ static ssize_t unionfs_write(struct file *file, const char __user *buf,
int err = 0;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);

@@ -104,7 +104,7 @@ static int unionfs_mmap(struct file *file, struct vm_area_struct *vma)

/* This might be deferred to mmap's writepage */
willwrite = ((vma->vm_flags | VM_SHARED | VM_WRITE) == vma->vm_flags);
- if ((err = unionfs_file_revalidate(file, willwrite)))
+ if (unlikely((err = unionfs_file_revalidate(file, willwrite))))
goto out;
unionfs_check_file(file);

@@ -149,7 +149,7 @@ int unionfs_fsync(struct file *file, struct dentry *dentry, int datasync)
int err = -EINVAL;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);

@@ -159,7 +159,7 @@ int unionfs_fsync(struct file *file, struct dentry *dentry, int datasync)
goto out;

inode = dentry->d_inode;
- if (!inode) {
+ if (unlikely(!inode)) {
printk(KERN_ERR
"unionfs: null lower inode in unionfs_fsync\n");
goto out;
@@ -196,7 +196,7 @@ int unionfs_fasync(int fd, struct file *file, int flag)
int err = 0;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);

@@ -207,7 +207,7 @@ int unionfs_fasync(int fd, struct file *file, int flag)

dentry = file->f_path.dentry;
inode = dentry->d_inode;
- if (!inode) {
+ if (unlikely(!inode)) {
printk(KERN_ERR
"unionfs: null lower inode in unionfs_fasync\n");
goto out;
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 7ee4760..021e206 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -35,7 +35,7 @@ static int unionfs_create(struct inode *parent, struct dentry *dentry,
unionfs_lock_dentry(dentry->d_parent);
valid = __unionfs_d_revalidate_chain(dentry->d_parent, nd, false);
unionfs_unlock_dentry(dentry->d_parent);
- if (!valid) {
+ if (unlikely(!valid)) {
err = -ESTALE; /* same as what real_lookup does */
goto out;
}
@@ -66,7 +66,7 @@ static int unionfs_create(struct inode *parent, struct dentry *dentry,
* first.
*/
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -115,7 +115,7 @@ static int unionfs_create(struct inode *parent, struct dentry *dentry,
}

err = init_lower_nd(&lower_nd, LOOKUP_CREATE);
- if (err < 0)
+ if (unlikely(err < 0))
goto out;
err = vfs_create(lower_parent_dentry->d_inode, lower_dentry, mode,
&lower_nd);
@@ -213,12 +213,12 @@ static int unionfs_link(struct dentry *old_dentry, struct inode *dir,
unionfs_read_lock(old_dentry->d_sb);
unionfs_double_lock_dentry(new_dentry, old_dentry);

- if (!__unionfs_d_revalidate_chain(old_dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(old_dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
- if (new_dentry->d_inode &&
- !__unionfs_d_revalidate_chain(new_dentry, NULL, false)) {
+ if (unlikely(new_dentry->d_inode &&
+ !__unionfs_d_revalidate_chain(new_dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -230,7 +230,7 @@ static int unionfs_link(struct dentry *old_dentry, struct inode *dir,
* .wh.foo first. If present, delete it
*/
name = alloc_whname(new_dentry->d_name.name, new_dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -362,8 +362,8 @@ static int unionfs_symlink(struct inode *dir, struct dentry *dentry,
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (dentry->d_inode &&
- !__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(dentry->d_inode &&
+ !__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -378,7 +378,7 @@ static int unionfs_symlink(struct inode *dir, struct dentry *dentry,
* first. If present, delete it
*/
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -522,8 +522,8 @@ static int unionfs_mkdir(struct inode *parent, struct dentry *dentry, int mode)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (dentry->d_inode &&
- !__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(dentry->d_inode &&
+ !__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -537,7 +537,7 @@ static int unionfs_mkdir(struct inode *parent, struct dentry *dentry, int mode)
* first.
*/
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -672,8 +672,8 @@ static int unionfs_mknod(struct inode *dir, struct dentry *dentry, int mode,
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (dentry->d_inode &&
- !__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(dentry->d_inode &&
+ !__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -687,7 +687,7 @@ static int unionfs_mknod(struct inode *dir, struct dentry *dentry, int mode,
* first.
*/
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -797,7 +797,7 @@ static int unionfs_readlink(struct dentry *dentry, char __user *buf,
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -844,7 +844,7 @@ static void *unionfs_follow_link(struct dentry *dentry, struct nameidata *nd)

/* This is freed by the put_link method assuming a successful call. */
buf = kmalloc(len, GFP_KERNEL);
- if (!buf) {
+ if (unlikely(!buf)) {
err = -ENOMEM;
goto out;
}
@@ -877,7 +877,7 @@ static void unionfs_put_link(struct dentry *dentry, struct nameidata *nd,
unionfs_read_lock(dentry->d_sb);

unionfs_lock_dentry(dentry);
- if (!__unionfs_d_revalidate_chain(dentry, nd, false))
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, nd, false)))
printk("unionfs: put_link failed to revalidate dentry\n");
unionfs_unlock_dentry(dentry);

@@ -959,7 +959,7 @@ static int unionfs_permission(struct inode *inode, int mask,

bstart = ibstart(inode);
bend = ibend(inode);
- if (bstart < 0 || bend < 0) {
+ if (unlikely(bstart < 0 || bend < 0)) {
/*
* With branch-management, we can get a stale inode here.
* If so, we return ESTALE back to link_path_walk, which
@@ -1030,7 +1030,7 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
diff --git a/fs/unionfs/lookup.c b/fs/unionfs/lookup.c
index 2109714..94e4c8e 100644
--- a/fs/unionfs/lookup.c
+++ b/fs/unionfs/lookup.c
@@ -119,12 +119,12 @@ struct dentry *unionfs_lookup_backend(struct dentry *dentry,
case INTERPOSE_PARTIAL:
break;
case INTERPOSE_LOOKUP:
- if ((err = new_dentry_private_data(dentry)))
+ if (unlikely((err = new_dentry_private_data(dentry))))
goto out;
break;
default:
/* default: can only be INTERPOSE_REVAL/REVAL_NEG */
- if ((err = realloc_dentry_private_data(dentry)))
+ if (unlikely((err = realloc_dentry_private_data(dentry))))
goto out;
break;
}
@@ -189,7 +189,7 @@ struct dentry *unionfs_lookup_backend(struct dentry *dentry,
/* Reuse the whiteout name because its value doesn't change. */
if (!whname) {
whname = alloc_whname(name, namelen);
- if (IS_ERR(whname)) {
+ if (unlikely(IS_ERR(whname))) {
err = PTR_ERR(whname);
goto out_free;
}
@@ -498,7 +498,7 @@ static inline int __realloc_dentry_private_data(struct dentry *dentry)

size = sizeof(struct path) * sbmax(dentry->d_sb);
p = krealloc(info->lower_paths, size, GFP_ATOMIC);
- if (!p)
+ if (unlikely(!p))
return -ENOMEM;

info->lower_paths = p;
@@ -534,7 +534,7 @@ int new_dentry_private_data(struct dentry *dentry)
BUG_ON(info);

info = kmem_cache_alloc(unionfs_dentry_cachep, GFP_ATOMIC);
- if (!info)
+ if (unlikely(!info))
return -ENOMEM;

mutex_init(&info->lock);
@@ -614,7 +614,7 @@ int init_lower_nd(struct nameidata *nd, unsigned int flags)
nd->intent.open.flags |= (FMODE_READ | FMODE_WRITE);
#ifdef ALLOC_LOWER_ND_FILE
file = kzalloc(sizeof(struct file), GFP_KERNEL);
- if (!file) {
+ if (unlikely(!file)) {
err = -ENOMEM;
break; /* exit switch statement and thus return */
}
diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c
index 8595750..72438fb 100644
--- a/fs/unionfs/main.c
+++ b/fs/unionfs/main.c
@@ -122,7 +122,7 @@ struct dentry *unionfs_interpose(struct dentry *dentry, struct super_block *sb,

UNIONFS_I(inode)->lower_inodes =
kcalloc(sbmax(sb), sizeof(struct inode *), GFP_KERNEL);
- if (!UNIONFS_I(inode)->lower_inodes) {
+ if (unlikely(!UNIONFS_I(inode)->lower_inodes)) {
err = -ENOMEM;
goto out;
}
@@ -319,14 +319,14 @@ static int parse_dirs_option(struct super_block *sb, struct unionfs_dentry_info
/* allocate space for underlying pointers to lower dentry */
UNIONFS_SB(sb)->data =
kcalloc(branches, sizeof(struct unionfs_data), GFP_KERNEL);
- if (!UNIONFS_SB(sb)->data) {
+ if (unlikely(!UNIONFS_SB(sb)->data)) {
err = -ENOMEM;
goto out;
}

lower_root_info->lower_paths =
kcalloc(branches, sizeof(struct path), GFP_KERNEL);
- if (!lower_root_info->lower_paths) {
+ if (unlikely(!lower_root_info->lower_paths)) {
err = -ENOMEM;
goto out;
}
@@ -462,7 +462,7 @@ static struct unionfs_dentry_info *unionfs_parse_options(
err = -ENOMEM;
lower_root_info =
kzalloc(sizeof(struct unionfs_dentry_info), GFP_KERNEL);
- if (!lower_root_info)
+ if (unlikely(!lower_root_info))
goto out_error;
lower_root_info->bstart = -1;
lower_root_info->bend = -1;
@@ -567,7 +567,7 @@ static struct dentry *unionfs_d_alloc_root(struct super_block *sb)
static const struct qstr name = {.name = "/",.len = 1 };

ret = d_alloc(NULL, &name);
- if (ret) {
+ if (likely(ret)) {
ret->d_op = &unionfs_dops;
ret->d_sb = sb;
ret->d_parent = ret;
@@ -596,7 +596,7 @@ static int unionfs_read_super(struct super_block *sb, void *raw_data,

/* Allocate superblock private data */
sb->s_fs_info = kzalloc(sizeof(struct unionfs_sb_info), GFP_KERNEL);
- if (!UNIONFS_SB(sb)) {
+ if (unlikely(!UNIONFS_SB(sb))) {
printk(KERN_WARNING "unionfs: read_super: out of memory\n");
err = -ENOMEM;
goto out;
@@ -637,14 +637,14 @@ static int unionfs_read_super(struct super_block *sb, void *raw_data,

/* See comment next to the definition of unionfs_d_alloc_root */
sb->s_root = unionfs_d_alloc_root(sb);
- if (!sb->s_root) {
+ if (unlikely(!sb->s_root)) {
err = -ENOMEM;
goto out_dput;
}

/* link the upper and lower dentries */
sb->s_root->d_fsdata = NULL;
- if ((err = new_dentry_private_data(sb->s_root)))
+ if (unlikely((err = new_dentry_private_data(sb->s_root))))
goto out_freedpd;

/* Set the lower dentries for s_root */
@@ -734,17 +734,17 @@ static int __init init_unionfs_fs(void)

printk("Registering unionfs " UNIONFS_VERSION "\n");

- if ((err = unionfs_init_filldir_cache()))
+ if (unlikely((err = unionfs_init_filldir_cache())))
goto out;
- if ((err = unionfs_init_inode_cache()))
+ if (unlikely((err = unionfs_init_inode_cache())))
goto out;
- if ((err = unionfs_init_dentry_cache()))
+ if (unlikely((err = unionfs_init_dentry_cache())))
goto out;
- if ((err = init_sioq()))
+ if (unlikely((err = init_sioq())))
goto out;
err = register_filesystem(&unionfs_fs_type);
out:
- if (err) {
+ if (unlikely(err)) {
stop_sioq();
unionfs_destroy_filldir_cache();
unionfs_destroy_inode_cache();
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index 37af979..bcd4267 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -212,7 +212,7 @@ static int unionfs_readpage(struct file *file, struct page *page)
int err;

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, false)))
+ if (unlikely((err = unionfs_file_revalidate(file, false))))
goto out;
unionfs_check_file(file);

@@ -276,7 +276,7 @@ static int unionfs_commit_write(struct file *file, struct page *page,
BUG_ON(file == NULL);

unionfs_read_lock(file->f_path.dentry->d_sb);
- if ((err = unionfs_file_revalidate(file, true)))
+ if (unlikely((err = unionfs_file_revalidate(file, true))))
goto out;
unionfs_check_file(file);

diff --git a/fs/unionfs/rdstate.c b/fs/unionfs/rdstate.c
index 0a18d5c..0fdd364 100644
--- a/fs/unionfs/rdstate.c
+++ b/fs/unionfs/rdstate.c
@@ -136,7 +136,7 @@ struct unionfs_dir_state *alloc_rdstate(struct inode *inode, int bindex)
sizeof(struct list_head);

rdstate = kmalloc(mallocsize, GFP_KERNEL);
- if (!rdstate)
+ if (unlikely(!rdstate))
return NULL;

spin_lock(&UNIONFS_I(inode)->rdlock);
@@ -217,7 +217,7 @@ struct filldir_node *find_filldir_node(struct unionfs_dir_state *rdstate,
* if the duplicate is in this branch, then the file
* system is corrupted.
*/
- if (cursor->bindex == rdstate->bindex) {
+ if (unlikely(cursor->bindex == rdstate->bindex)) {
printk(KERN_DEBUG "unionfs: filldir: possible "
"I/O error: a file is duplicated "
"in the same branch %d: %s\n",
@@ -249,7 +249,7 @@ int add_filldir_node(struct unionfs_dir_state *rdstate, const char *name,
head = &(rdstate->list[index]);

new = kmem_cache_alloc(unionfs_filldir_cachep, GFP_KERNEL);
- if (!new) {
+ if (unlikely(!new)) {
err = -ENOMEM;
goto out;
}
@@ -264,7 +264,7 @@ int add_filldir_node(struct unionfs_dir_state *rdstate, const char *name,
new->name = new->iname;
else {
new->name = kmalloc(namelen + 1, GFP_KERNEL);
- if (!new->name) {
+ if (unlikely(!new->name)) {
kmem_cache_free(unionfs_filldir_cachep, new);
new = NULL;
goto out;
diff --git a/fs/unionfs/rename.c b/fs/unionfs/rename.c
index 7b8fe39..226bcea 100644
--- a/fs/unionfs/rename.c
+++ b/fs/unionfs/rename.c
@@ -50,7 +50,7 @@ static int __unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,

wh_name = alloc_whname(new_dentry->d_name.name,
new_dentry->d_name.len);
- if (IS_ERR(wh_name)) {
+ if (unlikely(IS_ERR(wh_name))) {
err = PTR_ERR(wh_name);
goto out;
}
@@ -105,7 +105,7 @@ static int __unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,
whname = alloc_whname(old_dentry->d_name.name,
old_dentry->d_name.len);
err = PTR_ERR(whname);
- if (IS_ERR(whname))
+ if (unlikely(IS_ERR(whname)))
goto out_unlock;
*wh_old = lookup_one_len(whname, lower_old_dir_dentry,
old_dentry->d_name.len +
@@ -265,7 +265,7 @@ static int do_unionfs_rename(struct inode *old_dir,
goto out;
}
err = init_lower_nd(&nd, LOOKUP_CREATE);
- if (err < 0)
+ if (unlikely(err < 0))
goto out;
lower_parent = lock_parent(wh_old);
local_err = vfs_create(lower_parent->d_inode, wh_old, S_IRUGO,
@@ -351,7 +351,7 @@ static struct dentry *lookup_whiteout(struct dentry *dentry)
struct dentry *parent, *lower_parent, *wh_dentry;

whname = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(whname))
+ if (unlikely(IS_ERR(whname)))
return (void *)whname;

parent = dget_parent(dentry);
@@ -416,12 +416,12 @@ int unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,
unionfs_read_lock(old_dentry->d_sb);
unionfs_double_lock_dentry(old_dentry, new_dentry);

- if (!__unionfs_d_revalidate_chain(old_dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(old_dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
- if (!d_deleted(new_dentry) && new_dentry->d_inode &&
- !__unionfs_d_revalidate_chain(new_dentry, NULL, false)) {
+ if (unlikely(!d_deleted(new_dentry) && new_dentry->d_inode &&
+ !__unionfs_d_revalidate_chain(new_dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
diff --git a/fs/unionfs/subr.c b/fs/unionfs/subr.c
index 6b93b64..3183678 100644
--- a/fs/unionfs/subr.c
+++ b/fs/unionfs/subr.c
@@ -40,7 +40,7 @@ int create_whiteout(struct dentry *dentry, int start)

/* create dentry's whiteout equivalent */
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
- if (IS_ERR(name)) {
+ if (unlikely(IS_ERR(name))) {
err = PTR_ERR(name);
goto out;
}
@@ -84,7 +84,7 @@ int create_whiteout(struct dentry *dentry, int start)
}

err = init_lower_nd(&nd, LOOKUP_CREATE);
- if (err < 0)
+ if (unlikely(err < 0))
goto out;
lower_dir_dentry = lock_parent(lower_wh_dentry);
if (!(err = is_robranch_super(dentry->d_sb, bindex)))
@@ -172,7 +172,7 @@ int make_dir_opaque(struct dentry *dentry, int bindex)
}

err = init_lower_nd(&nd, LOOKUP_CREATE);
- if (err < 0)
+ if (unlikely(err < 0))
goto out;
if (!diropq->d_inode)
err = vfs_create(lower_dir, diropq, S_IRUGO, &nd);
@@ -213,7 +213,7 @@ char *alloc_whname(const char *name, int len)
char *buf;

buf = kmalloc(len + UNIONFS_WHLEN + 1, GFP_KERNEL);
- if (!buf)
+ if (unlikely(!buf))
return ERR_PTR(-ENOMEM);

strcpy(buf, UNIONFS_WHPFX);
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 4e0fe7c..1279df6 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -44,7 +44,7 @@ static void unionfs_read_inode(struct inode *inode)

size = sbmax(inode->i_sb) * sizeof(struct inode *);
info->lower_inodes = kzalloc(size, GFP_KERNEL);
- if (!info->lower_inodes) {
+ if (unlikely(!info->lower_inodes)) {
printk(KERN_ERR "unionfs: no kernel memory when allocating "
"lower-pointer array!\n");
BUG();
@@ -98,7 +98,7 @@ static void unionfs_put_super(struct super_block *sb)

/* Make sure we have no leaks of branchget/branchput. */
for (bindex = bstart; bindex <= bend; bindex++)
- if (branch_count(sb, bindex) != 0) {
+ if (unlikely(branch_count(sb, bindex) != 0)) {
printk("unionfs: branch %d has %d references left!\n",
bindex, branch_count(sb, bindex));
leaks = 1;
@@ -126,7 +126,7 @@ static int unionfs_statfs(struct dentry *dentry, struct kstatfs *buf)
unionfs_read_lock(sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -474,7 +474,7 @@ static int unionfs_remount_fs(struct super_block *sb, int *flags,
* strsep modifies the string and we need it later.
*/
optionstmp = tmp_to_free = kstrdup(options, GFP_KERNEL);
- if (!optionstmp) {
+ if (unlikely(!optionstmp)) {
err = -ENOMEM;
goto out_free;
}
@@ -521,14 +521,14 @@ static int unionfs_remount_fs(struct super_block *sb, int *flags,
/* allocate space for new pointers to lower dentry */
tmp_data = kcalloc(max_branches,
sizeof(struct unionfs_data), GFP_KERNEL);
- if (!tmp_data) {
+ if (unlikely(!tmp_data)) {
err = -ENOMEM;
goto out_free;
}
/* allocate space for new pointers to lower paths */
tmp_lower_paths = kcalloc(max_branches,
sizeof(struct path), GFP_KERNEL);
- if (!tmp_lower_paths) {
+ if (unlikely(!tmp_lower_paths)) {
err = -ENOMEM;
goto out_free;
}
@@ -662,7 +662,7 @@ out_no_change:
/* (re)allocate space for new pointers to lower dentry */
size = new_branches * sizeof(struct unionfs_data);
new_data = krealloc(tmp_data, size, GFP_KERNEL);
- if (!new_data) {
+ if (unlikely(!new_data)) {
err = -ENOMEM;
goto out_release;
}
@@ -670,7 +670,7 @@ out_no_change:
/* allocate space for new pointers to lower paths */
size = new_branches * sizeof(struct path);
new_lower_paths = krealloc(tmp_lower_paths, size, GFP_KERNEL);
- if (!new_lower_paths) {
+ if (unlikely(!new_lower_paths)) {
err = -ENOMEM;
goto out_release;
}
@@ -678,7 +678,7 @@ out_no_change:
/* allocate space for new pointers to lower inodes */
new_lower_inodes = kcalloc(new_branches,
sizeof(struct inode *), GFP_KERNEL);
- if (!new_lower_inodes) {
+ if (unlikely(!new_lower_inodes)) {
err = -ENOMEM;
goto out_release;
}
@@ -841,7 +841,7 @@ static struct inode *unionfs_alloc_inode(struct super_block *sb)
struct unionfs_inode_info *i;

i = kmem_cache_alloc(unionfs_inode_cachep, GFP_KERNEL);
- if (!i)
+ if (unlikely(!i))
return NULL;

/* memset everything up to the inode to 0 */
@@ -872,7 +872,7 @@ int unionfs_init_inode_cache(void)
kmem_cache_create("unionfs_inode_cache",
sizeof(struct unionfs_inode_info), 0,
SLAB_RECLAIM_ACCOUNT, init_once);
- if (!unionfs_inode_cachep)
+ if (unlikely(!unionfs_inode_cachep))
err = -ENOMEM;
return err;
}
@@ -959,7 +959,7 @@ static int unionfs_show_options(struct seq_file *m, struct vfsmount *mnt)
unionfs_lock_dentry(sb->s_root);

tmp_page = (char*) __get_free_page(GFP_KERNEL);
- if (!tmp_page) {
+ if (unlikely(!tmp_page)) {
ret = -ENOMEM;
goto out;
}
diff --git a/fs/unionfs/unlink.c b/fs/unionfs/unlink.c
index 3924f7f..c5f6ed5 100644
--- a/fs/unionfs/unlink.c
+++ b/fs/unionfs/unlink.c
@@ -79,7 +79,7 @@ int unionfs_unlink(struct inode *dir, struct dentry *dentry)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -148,7 +148,7 @@ int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
diff --git a/fs/unionfs/xattr.c b/fs/unionfs/xattr.c
index 7f77d7d..71ff7d0 100644
--- a/fs/unionfs/xattr.c
+++ b/fs/unionfs/xattr.c
@@ -30,7 +30,7 @@ void *unionfs_xattr_alloc(size_t size, size_t limit)
return NULL;

ptr = kmalloc(size, GFP_KERNEL);
- if (!ptr)
+ if (unlikely(!ptr))
return ERR_PTR(-ENOMEM);
return ptr;
}
@@ -48,7 +48,7 @@ ssize_t unionfs_getxattr(struct dentry *dentry, const char *name, void *value,
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -77,7 +77,7 @@ int unionfs_setxattr(struct dentry *dentry, const char *name,
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -106,7 +106,7 @@ int unionfs_removexattr(struct dentry *dentry, const char *name)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -135,7 +135,7 @@ ssize_t unionfs_listxattr(struct dentry *dentry, char *list, size_t size)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
--
1.5.2.2
-
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