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ovl: copy up regular file using O_TMPFILE
In preparation for concurrent copy up, implement copy up of regular file as O_TMPFILE that is linked to upperdir instead of a file in workdir that is moved to upperdir. Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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parent
42f269b925
commit
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1 changed files with 20 additions and 7 deletions
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@ -20,6 +20,7 @@
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#include <linux/fdtable.h>
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#include <linux/fdtable.h>
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#include <linux/ratelimit.h>
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#include <linux/ratelimit.h>
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#include "overlayfs.h"
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#include "overlayfs.h"
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#include "ovl_entry.h"
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#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
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#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
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@ -233,7 +234,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
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static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
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static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
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struct dentry *dentry, struct path *lowerpath,
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struct dentry *dentry, struct path *lowerpath,
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struct kstat *stat, const char *link,
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struct kstat *stat, const char *link,
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struct kstat *pstat)
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struct kstat *pstat, bool tmpfile)
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{
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{
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struct inode *wdir = workdir->d_inode;
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struct inode *wdir = workdir->d_inode;
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struct inode *udir = upperdir->d_inode;
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struct inode *udir = upperdir->d_inode;
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@ -263,12 +264,17 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
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if (new_creds)
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if (new_creds)
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old_creds = override_creds(new_creds);
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old_creds = override_creds(new_creds);
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temp = ovl_lookup_temp(workdir, dentry);
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if (tmpfile)
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temp = ovl_do_tmpfile(upperdir, stat->mode);
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else
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temp = ovl_lookup_temp(workdir, dentry);
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err = PTR_ERR(temp);
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err = PTR_ERR(temp);
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if (IS_ERR(temp))
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if (IS_ERR(temp))
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goto out1;
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goto out1;
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err = ovl_create_real(wdir, temp, &cattr, NULL, true);
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err = 0;
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if (!tmpfile)
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err = ovl_create_real(wdir, temp, &cattr, NULL, true);
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if (new_creds) {
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if (new_creds) {
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revert_creds(old_creds);
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revert_creds(old_creds);
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@ -300,11 +306,14 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
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if (err)
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if (err)
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goto out_cleanup;
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goto out_cleanup;
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err = ovl_do_rename(wdir, temp, udir, upper, 0);
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if (tmpfile)
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err = ovl_do_link(temp, udir, upper, true);
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else
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err = ovl_do_rename(wdir, temp, udir, upper, 0);
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if (err)
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if (err)
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goto out_cleanup;
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goto out_cleanup;
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newdentry = dget(temp);
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newdentry = dget(tmpfile ? upper : temp);
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ovl_dentry_update(dentry, newdentry);
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ovl_dentry_update(dentry, newdentry);
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ovl_inode_update(d_inode(dentry), d_inode(newdentry));
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ovl_inode_update(d_inode(dentry), d_inode(newdentry));
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@ -318,7 +327,8 @@ out:
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return err;
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return err;
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out_cleanup:
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out_cleanup:
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ovl_cleanup(wdir, temp);
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if (!tmpfile)
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ovl_cleanup(wdir, temp);
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goto out2;
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goto out2;
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}
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}
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@ -342,6 +352,9 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
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struct dentry *lowerdentry = lowerpath->dentry;
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struct dentry *lowerdentry = lowerpath->dentry;
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struct dentry *upperdir;
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struct dentry *upperdir;
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const char *link = NULL;
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const char *link = NULL;
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struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
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/* Should we copyup with O_TMPFILE or with workdir? */
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bool tmpfile = S_ISREG(stat->mode) && ofs->tmpfile;
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if (WARN_ON(!workdir))
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if (WARN_ON(!workdir))
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return -EROFS;
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return -EROFS;
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@ -373,7 +386,7 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
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}
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}
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err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
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err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
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stat, link, &pstat);
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stat, link, &pstat, tmpfile);
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out_unlock:
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out_unlock:
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unlock_rename(workdir, upperdir);
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unlock_rename(workdir, upperdir);
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do_delayed_call(&done);
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do_delayed_call(&done);
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