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author | Al Viro <viro@zeniv.linux.org.uk> | 2011-02-23 22:54:08 (GMT) |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-14 13:15:25 (GMT) |
commit | 13aab428a73d3200b9283b61b7fdf5713181ac66 (patch) | |
tree | b7350283378b60366609dca7b02c412b4632879e /fs/namei.c | |
parent | 47c805dc2d2dff686962f5f0baa6bac2d703ba19 (diff) | |
download | linux-fsl-qoriq-13aab428a73d3200b9283b61b7fdf5713181ac66.tar.xz |
separate -ESTALE/-ECHILD retries in do_filp_open() from real work
new helper: path_openat(). Does what do_filp_open() does, except
that it tries only the walk mode (RCU/normal/force revalidation)
it had been told to.
Both create and non-create branches are using path_lookupat() now.
Fixed the double audit_inode() in non-create branch.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r-- | fs/namei.c | 49 |
1 files changed, 20 insertions, 29 deletions
@@ -2292,19 +2292,14 @@ exit: return ERR_PTR(error); } -/* - * Note that the low bits of the passed in "open_flag" - * are not the same as in the local variable "flag". See - * open_to_namei_flags() for more details. - */ -struct file *do_filp_open(int dfd, const char *pathname, +static struct file *path_openat(int dfd, const char *pathname, const struct open_flags *op, int flags) { struct file *filp; struct nameidata nd; - int error; struct path path; int count = 0; + int error; filp = get_empty_filp(); if (!filp) @@ -2319,42 +2314,27 @@ struct file *do_filp_open(int dfd, const char *pathname, goto creat; /* !O_CREAT, simple open */ - error = do_path_lookup(dfd, pathname, flags | op->intent, &nd); + error = path_lookupat(dfd, pathname, flags | op->intent, &nd); if (unlikely(error)) - goto out_filp2; + goto out_filp; error = -ELOOP; if (!(nd.flags & LOOKUP_FOLLOW)) { if (nd.inode->i_op->follow_link) - goto out_path2; + goto out_path; } error = -ENOTDIR; if (nd.flags & LOOKUP_DIRECTORY) { if (!nd.inode->i_op->lookup) - goto out_path2; + goto out_path; } audit_inode(pathname, nd.path.dentry); filp = finish_open(&nd, op->open_flag, op->acc_mode); -out2: release_open_intent(&nd); return filp; -out_path2: - path_put(&nd.path); -out_filp2: - filp = ERR_PTR(error); - goto out2; - creat: /* OK, have to create the file. Find the parent. */ - error = path_lookupat(dfd, pathname, - LOOKUP_PARENT | LOOKUP_RCU | flags, &nd); - if (unlikely(error == -ECHILD)) - error = path_lookupat(dfd, pathname, LOOKUP_PARENT | flags, &nd); - if (unlikely(error == -ESTALE)) { -reval: - flags |= LOOKUP_REVAL; - error = path_lookupat(dfd, pathname, LOOKUP_PARENT | flags, &nd); - } + error = path_lookupat(dfd, pathname, LOOKUP_PARENT | flags, &nd); if (unlikely(error)) goto out_filp; if (unlikely(!audit_dummy_context())) @@ -2398,8 +2378,6 @@ reval: out: if (nd.root.mnt) path_put(&nd.root); - if (filp == ERR_PTR(-ESTALE) && !(flags & LOOKUP_REVAL)) - goto reval; release_open_intent(&nd); return filp; @@ -2412,6 +2390,19 @@ out_filp: goto out; } +struct file *do_filp_open(int dfd, const char *pathname, + const struct open_flags *op, int flags) +{ + struct file *filp; + + filp = path_openat(dfd, pathname, op, flags | LOOKUP_RCU); + if (unlikely(filp == ERR_PTR(-ECHILD))) + filp = path_openat(dfd, pathname, op, flags); + if (unlikely(filp == ERR_PTR(-ESTALE))) + filp = path_openat(dfd, pathname, op, flags | LOOKUP_REVAL); + return filp; +} + /** * lookup_create - lookup a dentry, creating it if it doesn't exist * @nd: nameidata info |